I don't think the raleigh will be a bad bike...not by a long chalk. There are better, but are they priced as well ?
You get Tiagra, no problems there, decent saddle, alloy frame, carbon fork...its all there.
Put it this way...we all know the reputation of older raleigh bikes, well made, last forever...well i got a Raleigh Chimera with Sora gears a few years ago, the forerunner to the Airlite, but chro mo framed, not alloy. Same geometry i think. It was a heavy bugger, but i did circa 6000 miles on it, for me it was a great value bike that needed very very little maintenance in that time) Wheels were rock solid (IIRC they were Rigida rims as well).
If nothings changed too much quality wise, i think it should be a good bike at that price point.