Hi,
I have the 150BT, I have had it for a couple of months now and did all of the fall clean up with it.
I have a lot of trees, and it did a pretty good job moving the leafs, both wet and dry. The only time that it had some trouble was trying to get leafs out of an area that had a lot of under brush, they were getting caught in the brush.
Other than the price difference the main thing that I didn't like about the 350BT was the extra weight. The 150BT is light enough that you don't really notice it. In one usage i went through 2 tanks of gas (about 2 hours), and you end up forgetting that it is on your back.
I didn't try the 350 so i am not sure how much more powerful it is, but I have been happy with the 150.
Let me know if you have any specific questions about it.
Jay :sword: