I'm a double ASE master mechanic for a living and GM world class certified. I work as a mechanic for a living. The RIGHT tool and a GREAT tool are not necessarily mutually exclusive. I have a Snap-On, Matco, and Craftsman compression tester. All three read identical probably within +/- 1%. I keep the craftsman at home for home use because the hose that connects it to the engine is short (about 2 feet). The other two stay at work. The Matco has about a 4 foot hose and the Snap-On about a 5 foot hose. I keep two at work in case one quits working, I have a backup, as it's my livelihood. Craftsman makes a great, easy-to-read tool with every adapter you could ever dream of! Great bang for your buck, as the expensive one won't gain you much for mini bike repairs.
As for feeler gauges, most feeler gauge sets range from .0015 to ,035. The only variations you need to consider are the purpose of what you will be using them for. They have angled blades (about 45 degrees) for places that are tough to reach, they also have tapered ends (that kind of form a point) so you can measure the clearance on a radius (think like between a throttle plate and the bore in a carburetor or throttle body). I have all different types and sizes, even some about 12" long to check my clutch packs and supercharger on my race car. They make a tool for everything, just depends on what you're looking for. No particular brand is better or worse than another, just make sure you get a brand you recognize, as the no-name stuff isn't finished with "as tight" of tolerances. I got my sets for work from Cornwell and they were rather inexpensive. I have Starrett for the race car because .0005" can make or break a successful run on the track.
As for the torque wrenches mentioned above, I couldn't agree more. Too many folks under-estimate the value and purpose of one. As a side note, I have a racing friend with ARP who tested all of my torque wrenches. Snap-On, Matco, Mac, Cornwell, and Craftsman. The only ones that remained consistently within calibration each season were the Craftsman ones. All of the others were recalibrated and sold on ebay. My toolbox at work and my race team torque wrenches are all Craftsman now and in 6 years I have not had to a single one recalibrated.
Hope this information makes sense and is helpful.