2 amps is the limit I seen recommended, but the charger I have that charges only thru the balance wires goes to 2.5amps.

It will vary depending on what capacity you're charging, but large capacity like 5000mah will obviously be slow to charge compared to a full 1C rate. The cells will be balanced, but I doubt any better than with most balancing chargers where the typical balance tolerance is < 10mv. I've seen no hard evidence offered that charging as low rates extends or enhances lipo life so the extra time is not really justified.

I use my charger to deal with prob cells only. I use one of my other balancing chargers otherwise. I've never checked the voltage other than to be sure the charger has finished, mine doesn't have a display, just changes light colors representing individual cells as they finish. Its the Hexatronic charger sold at HobbyCity by HobbyKing. If you use HK lipos, its a handy charger to have, sooner or later you'll have a weak or low voltage cell(s) and this charger will extend that kind of lipos useful life.