Arriving in a surprisingly small box, this is very much positioned as a follow-up to the 2019 Mega Drive Mini, with almost no games from that device returning here (I say almost, because it does contain the Mega CD version of Ecco the Dolphin, with the MD1 having the Mega Drive version, and where that machine contained Space Harrier II, this has an enhanced version beyond the capabilities of the original hardware. Sadly, while the MD2 has Earthworm Jim 2, the Mega CD version of the first game is not included).Emulation on the Mega Drive games is faultless from what I've seen so far. I did experience a bit of mild frame drops in Sonic CD, when moving through the air at speed, an issue I've seen in emulated versions of the game before, which are not present in the version in Sonic Origins (which is natively coded for each system, rather then being emulated). On a happier note, when you start Sonic CD, you get the choice of the US version, or the EU one that has the superior Japanese soundtrack (albeit at 50Hz, though you can change the system language to Japanese to get that soundtrack and the game at 60Hz). This is definitely a nice bonus.There's a wide and interesting selection of games here, including several previously Japan-only releases, and a handful of previously unfinished games brought to the Mega Drive for the first time. The only really notable omission is Sonic 3 & Knuckles, though I expect this is due to its inclusion in the Sonic Origins collection. It's a pity Sega couldn't do both, but I'm not surprised.Sadly only one controller is provided this time around, but thankfully it's based on the six-button pad (the mode button even acts as the menu button, though you can change that to "hold start" in the settings). The previous three-button pads from the MD1 work, plus you can use the RetroBit USB controllers (I recommend avoiding their wireless ones, as I found the battery died really fast, and you can't use them wired for some baffling reason).Regarding power requirements, I plugged the MD1 directly into one of my TV's USB ports. They apparently only provide 0.5A, and the MD1 says it requires 1A, but it worked fine. However, the MD2 says it needs 2A (presumably due to the slightly more powerful hardware required to run Mega CD games), and I wasn't confident enough that the TV could provide enough juice, so I dug out an old iPad plug, rated 2.1A, and that runs it perfectly. Beware though, there's no power light on the MD2 like there is on the MD1, and the power slider doesn't say "on" or "off" (left is on, weirdly).The controller is fine, with a reasonably long cable, but as I have an M30, I decided to use that. It took me a moment to remember how to connect it - it's been a while since I last used it - and though it had previously been paired with the MD1, it didn't want to connect to the Bluetooth dongle right away (there's a 2.4GHz version available too which is easier to connect). Once it did connect it didn't initially work, but thankfully I knew that this was resolved on the MD1 by holding up-left on the d-pad and the minus button for 5 seconds. Voila, we were in business (the button to the right of the minus button acts as the mode button, for menu access).It's a niche device aimed at retro enthusiasts and collectors. Though it is pricey, Sega said they are only producing limited numbers, particularly for the US and EU, so if you're thinking about picking it up, don't wait, because it might not last very long.