The Blade 350QX was a really good excuse to upgrade to a DX8
I had a DX7 but found that I had to rebind the thing quite a bit since it was dsm2. If you can, I would definitely suggest upgrading to the DX8. You don't have to ever touch the trim again to kill the motors. Just hit a switch on top and you're done. Then simply flick the rudder to start her up again. I LOVE this setup.