Getting frame protection is definitely a good idea. If the bike shop will do the install for you as part of the purchase, it's probably worth just buying the kit and having them install it.
If you want to save some coin, though, I went with this:
One roll did my whole Ibis Mojo HD (large), with tape left over for the fork legs (160mm 27.5). The install took me about an hour, not counting the time to take the bike apart and put it back together. DEFINITELY use the wet apply method. A little harder up front, but far superior results.
The invisiframe is *slightly* better in that it is cut specifically for your frame. But IMO the Bronson has pretty simple lines and with a pair of scissors and some patience, I think you can get just as good of a result from a roll of vinyl tape.
Im not getting a bronson, I going to get a YT Capra CF, since it's my first real deal, Im thinking about getting the Invisiframe, but the diference to a general kit is really big, I would buy a pair of new tires with the diference.