Product review (4 stars): Gets the job done, might have been better as a 90 angle not a T
Works well, fits in the very tight tolerance (only 1/8 inch or so) between my stove and countertop, with a little effort to push it in there. There is a slight gap under horizontal piece where crumbs could get under it if you wipe up going that directions, but not necessarily fall down the stove/counter gap to the floor. So I wouldn't recommend using the tape to make it permanent, so you can take it out and clean it occasionally. Not a major problem so far.

Due to the fact stoves and countertops are rarely perfectly level with each other, this might have worked better as a 90 angle piece, not a T, to eliminate the gap on the countertop side.  Most stoves already have a slight lip so the few crumbs that get on there during use are less likely to go down the side of the stove anyway, so you don't necessarily need the T side on the stove side.