This string trimmer combo is an excellent value. I have used it to weed-whack, cut hedges with the hedge trimmer attachment, brush cut, and the pole saw works very well too.
This is the experience I've had with the 26cc version. For me personally I do not feel that it is lacking power, and it being the lesser of the displacement options available translates into it consuming less fuel and being lighter weight.
All in all If you are looking for a great value option for a string trimmer- I wholly recommend this 26cc trimmer as it has been excellent for me.