If I am correct, Shindaiwa is owned by Echo. I have an Echo. The SRM 225. They are mostly the same; they have the same engine. I also have a few KM90r from STIHL.
At first, we loved the STIHL trimmers. When I got the Echo, we had problems with it and didn't like using it. After getting it fixed and using it for a while, we starting liking it and now we mostly use it. The STIHL are spending a lot more time on the rack. All in all, the STIHL trimmers run good, I've had some problems tho with them (coil and eating spark plugs). I think you will like the Shindaiwa a lot. I have tried it and it runs good. Things to keep in min tho:
STIHL is heavy
STIHL dealers are everywhere
ECHO is very light = not as tired.
ECHO is not very strong = you will want something stronger in the spring when the grass is long and wait or when you need to do some abandoned houses.
ECHO carb sucks on the SRM225
ECHO has a very nice handle
I say get it.