Some reviews have pop up on my twitter feed, it looks REALLY GOOD.
Nintendolife
Hardware Review: The Genesis / Mega Drive Mini Finally Does Sega's History Justice
The Verge
Sega Genesis Mini review: the best tiny console yet
Gamespot
Sega Genesis Mini Review: A Blast From The Past
IGN
SEGA Genesis Mini ReviewBlast processing at 55% the size.
Kotaku
Dualshockers
Nintendolife
Hardware Review: The Genesis / Mega Drive Mini Finally Does Sega's History Justice
While the Genesis may not have had as many groundbreaking and infinitely replayable titles as SNES did, it still has a treasure trove of great games that are begging to be rediscovered and the Genesis Mini features some of the best of the best. It's hardware plays and feels like it should, and that too is really the most important thing. Plus, with the added addition of save states, more will have the courage to venture through some of these games' toughest challenges. It's obvious to see that this wasn't just another product for Sega. The Genesis Mini is a well-crafted love letter to Genesis and Sega fans alike and is well-deserving of the Sega Genesis Seal of Quality.
The Verge
Sega Genesis Mini review: the best tiny console yet
The PlayStation Classic felt like a slapped-together product meant to capitalize on a trend. The Genesis Mini feels like the opposite: it's a tiny box meant to preserve and honor a beloved console.
Gamespot
Sega Genesis Mini Review: A Blast From The Past
the Mini has some issues, and for M2 fans it might be a little disappointing to see that it falls short of the team's most ambitious retro projects from the past, but for the most part the Mini is a very satisfying little console. It's got the looks, it's got a great selection of games that largely play faithful to the original experience, and it's priced just right at $80--though you may disagree if the six-button games like Street Fighter II are critical factors. Genesis fans have waited a long time for a system like this, and for once, we're happy to say that the latest official Genesis console is one worth buying.
IGN
SEGA Genesis Mini ReviewBlast processing at 55% the size.
The Sega Genesis Mini is the closest thing we have to a perfect all-in-one mini console so far. There are a few weird emulation issues here and there, but the sheer number of games and its delightful interface far outshines any graphical hiccups in these classic games. The quiet inclusion of different ROMs for different regions is one of those things that makes no sense at all to include while simultaneously making it feel even more lovingly crafted and special. It's hard to find much to really dislike about the Genesis Mini. The decision to include the 3-button controllers rather than the later 6-button ones is a bummer, but it only really matters for Street Fighter II. Even if I was more of a SNES kid growing up, the Genesis Mini is now my favorite retro mini console.
Kotaku
Dualshockers