We play/train with reballs almost every week.
We all mostly use shocker nxts and a couple of fst's running a varying amount of different upgrades, mine is standard with a virtue board and runs flawlessly. There are a couple of egos, geos and even ions and all work fine.
We have around 8000 reballs so most the time we don't run out meaning we don't have to re-use them before we wash the dust and dirt off them. If you don't have time to clean them before reusing then just be sure to fully strip and clean your gun afterwards just as you would when using paint.
Hope this helps.