I'd say not a problem, but it depends on the airline. Have flow both UT Air and Aeroflot and their 154's are fine. A bit noisier than western jets but everything is just that bit more 'solid' than what you might be used to. I like them... would I want to fly the North Atlantic in one? No. From St Petersburg to Moscow? Not a problem. Most risky part of the trip would probably be the taxi to and from the airport.