I've flown them a few times in the past
Most recently HEL-LED and LED-DME
Business class on the short flights (an hour each) are quite good with a full hot meal and good seats. The 737 that I flew on one of the legs looked like it came from Aer Lingus with the green seats with Irish poetry on them. They use the Finnair lounge in HEL. The Tupelov 154 looked to have been made over on the inside with good seats and again good service. I would fly them again, although I think that SU is better