I've done it a few times in different sims and the results were not consistent.
I remember on the 737-700 seeing it crashed twice on landing and thinking that it was an extremely serious position to be in. Quite recently I did it in a 737-800 sim and it was no real problem at all.
Simulators probably vary quite a bit in setup even though it shouldn't be that way. I guess the more important feedback would be from pilots who do it in the a/c every now and then?
Mayday all day long IMO.