The Oppo BDP-93 is an excellent Bluray and DVD player, there's no doubt about that. This modified version doesn't break any of that, and I would invite you to read the reviews on the unmodified player for all that information.
There are some quirks about that the modifications introduce to the machine, though. Until you figure them out, they can be greatly annoying to the point of thinking it's completely broken and/or doesn't work for some things any more. A couple of the other reviews which mention problems playing certain media seem to be the results of these oddities rather than actual problems with the player. I've thrown just about every type of CD, DVD (several regions), DVDAudio, Bluray (both regions), Bluray 3D (both regions), etc., into it and everything has played without a hitch.
Switching Bluray regions between A and B is a matter of turning the machine off, pressing a button (or buttons, see below) on the remote, and turning it back on. That's documented with the machine (and I've never found a player that automatically senses Bluray regions - it does automatically sense DVD regions and you don't have to mess with that). What they don't tell you is that switching between the two regions changes some settings, and that's the reason I'm giving this a medium rating.
For one example, if you switch on Region B, Netflix (and Blockbuster) disappear from the menu. The machine has to be set to Region A to play them (or see them). Likewise, if you do a reset or go into the easy setup wizard while on region B, it sets the TV output to PAL instead of NTSC, and your picture is garbled or missing until you go into setup and set it back.
Until you get everything set up to your satisfaction and understand how switching regions changes things, I kept it hooked up to a second TV with an RCA video cable, as I'd lose the HDMI signal and have a blank screen.
To clear up one other point, the BDP-93 has Wifi built in, you don't need any adapters or cables to take it on-line.
The players that are available from most of these vendors switches Bluray regions by pressing the power buttons, pressing 1 or 2, then turning the machine back on. However, at least one company does it differently and requires you to press something like Power, Dim, Dim, Dim, Dim, Audio. If the latter would be an issue for you - and it certainly was for me - then be sure to email the vendor before you make the purchase to confirm they use the simpler method.