For those still considering or wondering about the trimmer and blower, I wanted to give my review. Background, Within the past 10 years, I have owned and ran a landscaping company, I'm very picky about the quality of my equipment I use, and I still use a Stihl FS90R (commercial model) trimmer and Stihl commercial blower on my small personal yard. It's way overkill for my tiny yard, but I just have a hard time downgrading.
My dad's trimmer has been giving him trouble, so I saw that as an opportunity to give him the only Stihl trimmer I still have, and try out the M18 trimmer. I was pleasantly surprised with the quality and feel of the product, as well as the power output. It will take some getting used to not hearing the motor, so it's harder for me to "feel" the torque and rpm. I'll be taking it to a field with tall grass tomorrow to see how it compares to the FS90R.
Also, I actually prefer that blower to ANY handheld blower I've ever used. The weight is really nice, it's not constantly sucking in my pants/shorts into the side of it, and it performed great! I didn't plan on getting rid of my Stihl blower, but I might just have to now.