EGO MST1603 Review: An Attachment-Capable String Trimmer With Powerload Line Feeding

Introduction

EGO’s cordless string trimmer lineup has been reviewed extensively, and the newest addition is the MST1603, an attachment-capable model with Powerload line feeding. This is the first time EGO has paired its Powerload technology with its multi-head system, and it changes the calculus for homeowners who want one power head that can drive a whole family of tools.

This review covers what the MST1603 is like to use, how it performs, and whether it deserves a place in your garage.

Design and Key Features

Starting with the basics, EGO uses a brushless motor at the battery end of the tool. Most of EGO’s dedicated string trimmers place the motor weight at the trimmer head, but that isn’t possible on a multi-head system, since every attachment would otherwise need its own motor and the whole value proposition of a multi-head platform would fall apart.

Unlike some trimmer designs, the cutting head isn’t reversible. That’s not a dealbreaker, and you still get a wide 16-inch cutting swath. A two-speed electronic switch helps you manage RPMs, which is particularly useful when running other attachments, and a variable speed trigger adds even finer control at low speeds.

EGO uses a carbon fiber shaft on both the power head and the string trimmer attachment to reduce overall weight and absorb more vibration than you typically get with metal shafts. The unit weighs 9.5 pounds without a battery and 12.3 pounds with a 2.5Ah battery installed. Lightweight doesn’t mean weak here: carbon fiber is structurally strong, and EGO backs the shaft with a lifetime warranty.

Performance, Runtime, and Handling

At low speed, a 4Ah battery runs the trimmer for roughly 45 minutes. It’s worth paying attention to how much trigger time you actually need: most homeowners with properties up to an acre or more can likely trim at high speed without swapping batteries.

If you’re tackling large plots with thicker grasses, plan on having an extra battery or two on standby. The two-speed switch and variable trigger make it easy to modulate power for the job at hand rather than burning through the pack unnecessarily.

Powerload Line Feeding: The Standout Feature

This may be the most innovative thing EGO has done with string trimmers in a long time. If you’re new to the feature, Powerload automatically winds your trimmer line, saving you the irritation of spooling it manually. You feed the line through the trimmer head to its halfway point, press the self-feed button, and release it once the line spools up to just over the desired working length. Running the trimmer at full speed then cuts the line to the correct length automatically.

The engineering question is how EGO pulled this off on a tool that breaks in half. On a regular string trimmer, power to the Powerload button at the head is straightforward because there’s already a wire running down to the motor at the head. On the MST1603, the brushless motor and battery sit at the back with no visible wiring, and the power evidently travels through the shaft and internal body of the tool from back to front. Whatever the method, the result is genuinely impressive.

Attachment Compatibility and Build Quality

The power head is compatible with EGO’s full range of Powerhead multi-head attachments, including hedge trimming, edging, cultivating, pole saws, brushes, and even a snow shovel. Because of the drive shaft design, it is not compatible with non-EGO attachments, so buying into the platform means staying within it.

That limitation is also the platform’s appeal: adding attachments over time is far less expensive than buying complete standalone tools, so the initial investment stretches further as your yard work list grows.

Is the EGO MST1603 Right for You?

Price matters, and the MST1603 comes in at $379.99 as a kit. That includes the power head, the Powerload string trimmer attachment, and a 4Ah battery with charger. It’s slightly more expensive than EGO’s top-rated ST1620T with Line IQ, which is worth keeping in mind if attachment capability isn’t something you actually need.

EGO covers the string trimmer with a five-year tool warranty, on top of the lifetime warranty on the carbon fiber shaft. Overall, this trimmer is ideal for homeowners looking for a premium solution who want the option of adding attachments to extend the usefulness of their investment.

Conclusion

The EGO MST1603 combines a capable brushless power head, a light and durable carbon fiber shaft, and the genuinely clever Powerload self-winding system in one package. If you value a multi-tool platform and want trimming, edging, hedge work, and more from a single battery system, it’s an easy recommendation. If you only ever plan to trim, a dedicated model like the ST1620T may serve you just as well for less money.