I haven't had any problems with them. I have installed them on a few test
boxes. My BBS is still Warp4 because I never got SIO2K to work under eCS 1 or
1.1 in -any- test box. Couldn't get vmodem ports to work anyway, and DOS sessions always gave an error about mis-matched versions or such.

Yeah, I was getting the same results here, and when I installed SIO 16.0d and try to run VMODEM I get:

[D:\irex]vmodem
A non-recoverable error occurred. The process ended.

Do you or anyone else have any ideas? Myself, I am running eCS 1.2.
--- BBBS/2 v4.00 MP
* Origin: Buffalo Online * Lancaster NY * buffalo.sytes.net (1:3407/4)