As someone who LP's frequently, I'm familiar with FRAPS (as well as Camtasia and Bandicam) and I can say that the only real issue with FRAPS is that it makes new files every time one hits 4 gigs in size (which depending on what you're recording could be anything from 2 minutes to 4), meaning that putting anything together with it can take a while, as you have to splice video together, and compress it, if you mean to upload it anywhere.
15 minute video, 29 gig file, good gravy.
It also doesn't work on some older games (Gabriel Knight series) or PSX-Fin, or even ZSNES, which is a shame.