I fly with Manx quite often on their LETs. I always look forward to flying them because they are fun, and different, and for those short flights, depending on your market and routes, it might not matter that they're not very comfortable.
On the downside, they are odd looking, noisy, and not very comfortable, but that is a function of the seating you might choose rather than the aircraft.
I would also suspect that like many East European products, they are fairly simple, well built, and robust - but that's a guess.