I'd echo what the others have said, my experience of the Exeo has been overall positive, comfortable, refined with a great spec and hard to find anything giving better bang for your buck on the second hand market.
Only real let down is the fuel consumption isn't on a par with say an Octavia, not wallet drainingly bad but certainly not class leading.
My advice would be go for an ST with the highest spec you can find, you may not want all the toys but it'll definitely
help future resale especially as the Exeo was never a great seller (probably due to Seat never really pushing the marketing in the UK).
I've never been disappointed with my choice, friends and family are all complimentary and after he first serviced it my mechanic said "it's a good motor", which from him is gushing praise!