Yeah, I was referencing the XCM or HDE adapters. Since I was considering buying one, I looked at a bit of comment reviews. From what I deduced, they add a bit of input delay, making them bad for fighting games, but they work OK for shooters. It'd feel like you were playing on the 360 for the most part.
Turbo is basically a cheating feature added to some adapters, and lots of reviews seem to report it not working properly... which isn't surprising.
Why I mentioned the adapters, is that you can pickup the HDE adapter for 15 dollars. If you already have an Xbox360 controller, you'd be able to use it on the PS3 with the drawback of it having a little increased input delay. For shooters, it'd be an OK option, since I'd rather have the slightly increased input delay, than the hugely increased deadzone in something like the Power A Pro EX Controller for PS3.
Again though, it would be more ideal to just get used to the DS3. Add some trigger grips, and adjust to the analogs for a little while, and after a few weeks you might start to prefer it to the Xbox360 controller....
*Quick "I'm not a Sony fanboy" disclaimer*
I have a PS3, Xbox360, Gaming PC, 3DS, and a Vita. For controllers, I have among others, a wired Xbox360 controller, a wireless 360 controller, and 2 DS3s. Even though I've managed to get my DS3s to work on the PC using Motion In Joy, I still find it easier to use the wired 360 controller for PC games that require a controller.... and wired 360 over wireless, since the wireless controller has issues with some games refusing to recognize the triggers properly without hacking game files. So, what I guess I'm saying is that I get good use out of my 360 controllers. Especially my wired one.