Hmm, I know they have advanced, but I'm still not confident about durability/reliability.
Considering a 10MB/s constant rewrite speed (which BTW would kill performance used as RAM), that would give about 10 years in durability if used under load 24/7. That's obviously a lot but we don't know the exact figures for the SSD used in the N900 and we don't know how efficient is the algorithm (specially if the SSD has less empty space).