Looks in really good nick that one!
I've had mine just over a year now, and it's been a mixed bag. The ride's better than the Omega, it's quieter, and the engine seems to deliver too but it seems to deliver the power either really, really smoothly (5-speed auto) or there's this noticeable pause where the engine builds and the gearbox seems to get ready to drop a cog, at which point it's pretty damn quick given how much it weighs. Interiors relatively cramped compared to the miggy, and I get frustrated at the lack of rear passenger legroom (as my kids kick the back of the seats, or I can't actually get the drivers seat back to a properly comfortable position with the baby-seat behind mine).
...but, all-in-all, I'd actually like to get rid of mine soon and get another Omega. I've been stung a couple times for suspension work, and the build quality varies from either bomb-proof or really flimsy - nothing in between. I had two miggies, and would love another, but only an Elite
Window regulator is a known problem though. Unfortunately one of the 'flimsy' bits as there's plastic guides which break quite easily. I had a horrendous sound from my passenger window a while ago - £80 for new regulator. As for the suspension, I think when it's good, it's really good, but I'd much rather be replacing the wishbones on the Omega! Much quicker, easier and cheaper.
I didn't realise they did the Jag without leather!