Hi there axeboy90,
At micros I have played Unibet for around 9 months but I have only played nl4/nl10 with a very occasional foray into nl20.
Things you may like to consider when thinking of moving to Unibet;
1. 30% rakeback as mentioned, just make sure you enter your details here correctly!
2. Most tables will be labelled 'Anonymous' as these are the most favoured amongst the populace. This means no screen names or avatars are visible except Hero's own one. Players are instead labelled by their seat position, i.e.,
Player 1
Player 2
player 3
etc.
3.Each player label remains static, so for example when one player leaves the 'Player 3' seat and another joins, the new player inherits 'Player 3'.
This of course will have consequences for statistic collection as only the 'Current Session' statistics are available. I found Holdem Manager 2 does now reset the statistics for each player label to zero if they leave though, which is a huge help when multitabling.
4. They have 'Blaze Poker' which a variant of Rush and Zoom, but you will not be able to use a HUD because of the way Microgaming collects and stores hand histories and Holdem Manager say they have no plans to implement support for it in the future.
5. A biggie.

I think this is the loosest player pool on the planet at micros and a huge proportion of pots are multiway even in 3bet pots. High variance is a way of life there, so take your best non-tilt mindset with you - especially at weekends - and enjoy the ride!
6. Nearly all games are 6 max. There is a dearth of full ring games at nl4 and nl10, but I have found them more at nl20 [again, mostly at weekends] and the play is hardly different to nl4.
7. I usually find enough tables for me (6-8) at nl4/nl10 and nl20.
Hope that's of some use to you.
Regards,
Mal.