I tried Pro Tools 10 (was included with the Eleven Rack I bought, and sold).
I had many issues with hardware compatibility that I didn't have with the former Cubase SX. So I had to upgrade my PC for a pretty steep amount (12 gB Ram, Win 7 64-bit, new Intel i7 since it refused to install on my AMD system, couple of new HDD). Pro Tools is very sensitive for what hardware you have, and what other programs are runnng...
I installed Pro Tools and it worked ok, but still had issues with Eleven Rack ins and outs sometimes not showing, PT froze every now and then. And I felt the system was not stable, and took forever to start. Also PT 10 does not run in 64 bit, only 32 so it only uses 4 gB of RAM.
Also I'm not happy that I needed to use a USB-dongle, I find I'm quickly runnin out of USB ports.
So for me it was a very bad experience. I swapped the Eleven for an Axe Fx II, and Pro Tools for Presonus Studio One. Presonus is crazy fast, light on resources, does everything Cubase did and more, and never had a crash, I'm very happy...
This sounds like I'm totally bashing Pro Tools, but it wasn't my intention. I'm sure Pro Tools is a great tool if your system is adjusted to it, so I'm happy for you quadrium! If it inspires you to make music it's all good!!