I really rate the G2s if you're on a budget, been running a set for about a year, skating shitty grubby UK spots and in damp weather too, I would say I've put about 100 days skating on them...they haven't jammed up and do what they need to.
I've cleaned them about every 3-4 months (reminds me they are probably due), but they're still running fast and nothing has broken.
Pretty impressed tbh, would happily buy the G2s again.
You don't have to spend big on bearings, but cleaning and maintaining makes a world of difference to how long they'll last.