I keep my Protege RMP on an older version of Windows because of one issue. (I use Win2000)

The Protege CTX used a non-standard RS-232 implementation. Windows XP and later OS versions use some form of buffering that can cause delays in downloading and uploading data. I learned this at a site that took over an hour to download. Sprint Tech Support (yeah, this was before Sprint shut down) confirmed the problem and I never heard of a good work-around.

This issue did not appear in the LTX model.