replacing dumb terminals

Hi all,

Has anyone used tn5250 & linux to replace dumb terminals, specifically for 
the sort of user that enters data all day, every day?

I've only just found this emulator and my testing somewhat limited, though 
I've found a few issues already.

The keyboard mappings! Though it looks like most can be brought into line via 
config files, judging by the list's archive it would appear that the are 
still issues. Has anyone got it exactly as one would expect from using 5250?

Another concern is reliability. My experience has left me with the impression 
that tn5250 has problems launching in X. Sometimes it connects to the host, 
others it doesn't. Initially I had no such problems, where as now it's quite 
common.

132 column displays appear to be unfinished/buggy, in that going from 80 to 
132 (wrksplf, seu etc) stretches the window accordingly but leave the screen 
mode in 80 columns; however, not every time.

I'm hoping most, if not all of these problems are related to my configs, X, 
KDE et al. 

Feedback would be appreciated from anyone who's been through this before.

Thanks,
Tony.

PS. Any '400 programmers using it full-time instead of doze/client access?