haven't had a glitch in any of my R/C stuff since switching to PCM systems back in 1986. never had a hold or lockout with any system either.
haven't used a temp gun, i no have one, but after a full flight, avg 12-14 min, nothing i could put my hand on was much over ambient temp. motors/ESCs/batteries.
now, if you are just looking around, researching what is the best of frames, motors, ESCs,, my advise to ya is just go ahead and buy what looks good to ya. like anything else, you can waste a lot of time trying to get the BEST, only to have that change a week or so after you get yours. i would not get something that a LOT of folks are having problems with, but something that only one or two folks report problems with is most likely ok. if ya got folks flying copters in yer area, get with them and pick their brains for what has and has not worked for them.
the important thing is to get something, and get started flying it, and learning just what you really want, not what you thought you wanted.