Anyone else order from Amazon and have it arrive in a bubble mailer? Predictably my box is thrashed, already started the return process and have one ready for pickup at Best Buy. Should have just done that in the first place.
Yup, I was a bit shocked to see the bubble mailer on my doorstep yesterday. Lately Amazon has been great about sending things that generally warrant a box, well, in a box. No actual dents on mine (I live 5 minutes away from an Amazon shipment center... which ships them to a delivery center further away, then back to my house - WTH :lol

, though the front of the box has some slight pressure marks. Not bad enough for me to send back, and not so bad that my collector OCD felt the need to get a "perfect" one.
Anyway, sorry to hear about the damage. Their packers don't always stay consistent or make sense. One time I ordered a cheapo replacement power cable for an old boom box, and they send the 6' cable in a box big enough to ship two folded suits. I could go on about other orders, but I'd get really, really off topic
Overall I'm absolutely loving the Genesis Mini. I figure $80 is well below what I would have comfortably paid for a Japanese version of Contra: The Hard Corps years ago when the price was reasonable, and now I pretty much own three versions of the game. I think the selection of games is outstanding overall, and I understand why some games aren't on there as they're already on other compilations (and are possibly tied up because of it). I would have preferred Ristar or a few other games (Pulseman would have been a really neat treat) over the likes of Eternal Champions, but again, for the price and the performance it's tough to be upset about the package as a whole.
The pack-in controllers are beautifully faithful to the originals
, though I keep reaching for the Start button in the old place 
(edit: pack-ins have the Start button in the correct place - got confused with the 6-button version which I've been using the last 25+ years) I enjoyed using them for nostalgia's sake, but like @defpally I bought the shoulder-buttoned Retro-bit 6-button pads ahead of time. Those are glorious, and control and feel just as well as my original 6-button pads. The Mode button is incredibly handy for accessing the save and load options, and I honestly can't go back to the original pads. I highly recommend these pads, especially since they're USB and switchable between X-input and D-input.
Yes, there is some sound delay which is unfortunate, but after playing through the game list for a few hours it honestly didn't bother me much, and I forgot about it altogether most of the time thereafter (and I'm usually sorta picky about that kind of thing, so take that as you will). I'm pretty happy with the input response on the Mini versus the (for me) annoying lag in the Genesis Classics Collection, so a tiny bit of audio lag on the Mini is a welcome compromise.