I just modded a V2 PS2 with a Duo2SE, aswell as 2 v1 Xboxes with DuoX2 modchips, making a total of 5/5 succesfull mod installs. The other two were both PS2s, v1&v4 with Messiah 2 Pro.
Not many people are posting their success for their mod installation, usually just problems so it's hard figuring out whch chips are good. I gotta say these Duo chips are awesome. I got them for $21 USD each at foundmy and they work just as promised. In the case of my PS2, easier to install then my M2s. Still, compared to the PS2 installs I did, the Xbox mod is childsplay. Seriously, I think a drunken monkey on steroids can install a DuoX2 lol. Don't see any need to get anything better, you don't need a flashable mod in the PS2 nor do you need 7 banks in an Xbox mod ^^. Great price, great performance and pretty high quality built too. The PS2 mod is better built in the Xbox one, and even comes with a peel off sticker to mount in on the mainboard. Hmm, now why didn't my $70USD Messiah 2 come with one of those when I bought it long ago?
For those looking to mod should seriously consider the Duo series modchips, DuoX2 for Xbox and Duo2Se for PS2. Great buy, and no problems just the way I like it ^^.