My sons usually appropriate what I build.
The only kit I remember putting away in frustration was Italeri's Autoblinda.
I swear by Vallejo, primers, Panzer Aces, varnishes, all of it. The only knock I had on them was being hard to shake. I adapted an old bandsaw into a shaker and never looked back. A while back I used Tamiya acrylics, but once my sons started ABing, I wanted them to use true acrylics, not ether based, so Vallejo and Reaper it is.
I use them on a lot of RC tanks that plow through obstables, when applied right, it's as tough as any finish I've come across.
If you're painting figures and use a wet pallete, you can keep them fresh for a week or so.