Never owned a 1050 but my best mate has one, yes the head lights aren't brilliant and he has had the suspension done but overall it is a good bike, I had a 57 plate GS (now a 13 GS LC TE). The fuel consumption was about the same on a long run between his 1050 and my old GS.
It seems comfy enough and the ride is good, he's faster through the bends than me. But it is more road biased that the GS. You'd never take one off road!
Triumph have built it to a price point that's obvious but in my view it is excellent value for money.
The only other down side is the std boxes, both very small and double skinned so actually smaller than they look inside! He's done a cleaver mod which is to get a low level can, then he made a rail for the exhaust side so can use a full box from a sprint, on that side. He sells the rails..
He's done 22k+ miles and so far no issues.
The new tiger sport solves some of the light and suspension issues so if you were looking at new wait for that, if you were looking 2nd hand, you shouldn't have trouble finding one
Check out tiger1050.com too!