Having seen some inquires about clear bras and thought I would share some thoughts after doing a lot of research. My own opinions. Not knocking any product or installers abilities.
#1 The product XPEL seems to be better than 3M. XPEL can "self-heal" and is easier to clean. (My opinion)
#2. Make sure they are certified XPEL installers. The company is happy to verify for you. They should be able to cut kits themselves in house. A good installer will be happy to show you the equipment. Self cutting bulk product takes an "extremely" talented person. (he should of been a surgeon) Some self-cutting can be necessary ie door edges, underneath door handles
#3. If the shop is clean and has good lighting equipment (wall mounted) it shows the installer is meticulous.
#4. PRICE! For example: A JEEP Grand Cherokee should be in the $900.00 range. That should include full front (including PDF at bottom) with about 18 inches up the hood, sides, door handles indents (cannot door chrome mirrors or door handles), headlamps, door edges.
A good install is worth the money. Just take the time to shop at 2-3 shops.