Ventless Dryers, yay or nay?

[Colin L.]

I'm considering specifying vent-less electric dryers in an apartment project I'm working on.  I'm curious if anyone has any recent experience with them?  The reviews I've been reading about new models is that the quality of drying has vastly improved. I like that they are energy efficient, and water is drained via same drain as the washer, rather than expelled via the vents where lint often gets caught (and rarely cleaned).  Is there some other maintenance/upkeep issue that I'm missing that would make me want to avoid using them?