That's the only downside so far
It's a fair bit louder than my previous laptop. Have you got one?
Not yet. I'm tempted though. The fan noise is the only real concern. There is another version due out shortly (the TM2) which has a C2D and a Wacom based screen rather than NTrig. So it is quieter and pressure sensitivity works n Photoshop. The downside though is that it will obviously be more expensive and it also has a weaker graphics chipset. The TX2's HD3200 seems ok for a bit of occasional gaming but the rumoured Intel stuff on the new TM2 is likely to be weak.
I read somewhere that you can adjust the fan settings in the BIOS which can help a bit.