Ongame has great traffic for 5max STTs, bonus is equivalent to 50% rakeback (at least for bwin where I play sometimes), but the software could be better. It's a bit too heavy for a poker software, time bank is ridiculously low, hard to play more than 6 tables and not time out etc.
The maximum bonus on bwin is 100% up to $1000 so I guess it can be hard to clear it playing low stakes because you can't really mass table.
You're going to find regs there, but as Ongame's skins are related to sports betting, you'll see quite a few degens like this guy ($54 5max):
No Limit Holdem Tournament
OnGame
5 Players
Hand Conversion Powered by weaktight.com
Stacks:
UTG (2,000)
CO (2,000)
Hero (1,990)
SB (1,980)
BB (2,030)
Blinds: 10/20
Pre-Flop: (30, 5 players) Hero is BTN K♦ A♥
UTG raises to 60, CO calls 60, Hero calls 60, SB calls 50, BB raises to 360, UTG folds, CO folds, Hero goes all-in 1,990, SB folds, BB calls 1,630
Flop: 6♦ 8♣ 5♠ (4,200, 2 players, 1 all-in)
Turn: 3♥ (4,200, 2 players, 1 all-in)
River: 9♠ (4,200, 2 players, 1 all-in)
Final Pot: 4,160
BB shows STRAIGHT NINE
7♦ 2♦
Hero shows HIGH_CARD ACE
K♦ A♥
BB wins 4,160 (net +2,150)
Hero collects 40 (net -2,010)
SB lost 60
UTG lost 60
CO lost 60