I have about 25 of these units (and a few 114's) and the work really well.

I've found a few timing issues using them in TCP mode, quite often they wont reconnect, and you have to quit catalyst a few times to get them connected, which is a major pain if you have more than one on your system.

I've found it much more reliable to run them in UDP mode. There's no real difference to the end user except you set them to UDP on the box and in the OSX serial setting window, and they will no longer say connected in the status window.

Hope you find this helpful

Also thanks Huw for an informative reply