I ordered three different "bumper" cases. Two "Generic Cases" are the same type, just different colors (orange / black). The other is the SGP Neo Hybrid EX (yellow). I knew going in that I would probably have to make my own hole for the top microphone since all of the cases were designed for the i9100 version of the GS2.
All three of them together.
The generic cases:
How much: $10 (shipping included)
Where: Ebay seller superloverseller, description ?TPU BUMPER FRAME CASE COVER SKIN FOR SAMSUNG GALAXY S2 S 2 II i9100 USA SELLER?
http://www.ebay.com/itm/TPU-BUMPER-FRAME-CASE-COVER-SKIN-SAMSUNG-GALAXY-S2-S-2-II-i9100-USA-SELLER-/220870704009?pt=LH_DefaultDomain_0&var=&hash=item79157455a4Material: TPU.
Feel: The volume/power buttons are a bit squishy with it on. You don?t get the positive feel of a button. The buttons work fine, just not much tactile feedback. The TPU is not super grippy, but not slick.
Fit: Fit well. Maybe could be a little more tight.
Appearance: The rubber has small imperfections, but overall fine for a cheap case. The black version is somewhat glossy, but does not have that super glossy cheap look IMO. The orange is by far my favorite of the two cheapies.
SGP Neo Hybrid EX:
How much: $26.99 (shipping included)
Where: Ebay seller unitedsgpcorp (they appear to be SGP USA), description ?SGP Samsung Galaxy S2 Case Neo Hybrid EX Series [Reventon Yellow]?
SGP Samsung Galaxy S2 Case Neo Hybrid EX Series Reventon Yellow | eBay
Material: Soft rubber insert with a thin plastic shell
Feel: The volume/power buttons still have a lot of ?feel? to them. The plastic shell is not as slippery as I thought it might be.
Fit: Good
Appearance: You definitely pay for quality here. It has high quality fit and finish.
Generic case(s) pictures (one orange, one black)
Generic case on the phone
Plenty of lip on the front to keep the screen off flat surfaces when laid down.
The back lip (not pictured) keeps the camera back off flat surfaces when laid down. It has a little more lip than the Hybrid EX
The black version of the generic case showing the battery cover can be removed with the case still on (the Hybrid EX also allows for battery cover removal).
The new microphone hole on the generic case (I used a punch to make the hole). You can also see some of the imperfections in the rubber that I mentioned. The picture exaggerates the imperfections and it looks fine unless you get right up on it.
SGP Neo Hybrid EX pictures
The two parts together (soft rubber liner and think plastic shell)
On the phone
Plenty of lip on the front to keep the screen off flat surfaces when laid down.
The back lip (not pictured) is just enough to keep the camera off flat surfaces when laid down.
The new microphone hole (used a punch to make the hole).