I have only flown short haul with them too, but my my experiences have been such that I'm delighted they have expanded their horizons.
They are an excellent airline. I don't know why, but everything just seems so much easier with them. There never seem to be long check in queues (although you do have to self service check in at Heathrow, but it's easy), and the planes are really spacious. Everything also always seems to be early or on time. I'm sure that's not always the case, but they have a decent sized fleet, which is reassuring.
I have found the staff to be super friendly and helpful - when we boarded a flight last year, the air hostess took my little girls hand and led us both to meet the pilot in the cockpit!
I just got back from Nice last night, and in the inflight magazine it said how they are making all of these changes, and introducing online check-in etc, so that will make things even easier.
I'm sure you won't be disappointed!