The online play isn't as detailed as the PC version, but then I've always believed CM/FM to be more popular as a solo pursuit anyway.
The achievements are a nice addition though, some are pretty hard to get too.
The speed is the major difference for me. It's a good 3 times faster than my PC version and I've not got a poor PC.

On a normal TV the match engine is slightly 'cramped' (the pitch is bordered and players look bigger), but to be honest after playing it for the past 2 weeks then looking at my bro playing the PC version, the PC match engine now looks too small! lol
If you have a HDTV apparently the in-game resolution is much larger though and this
prob is all but eliminated. Just like the control system, you get used to it all fairly quickly if you stick with it.
Overall it's an awesome game, one of the very best I've ever had the pleasure to play. There's a possible save game bug doing the rounds though at the mo, but if you save on multiple files I don't see it spoiling yer enjoyment.
So buy buy!