I have the 880 and it works well with the frankenstein system I currently have. I have had custom hex codes from pronto machines and others imported into my remote several times and customer support has always been responsive (within a day or two) in getting them done.
The web interface is a bit clunky and took a few tries to get everything the way I wanted, but once everything was setup I haven't had a single problem and I haven't met anyone who couldn't figure out how to work my somewhat complex system on the first try.
I saved the ROM file that is installed from the web site, so I can restore my entire remote setup easily in a few minutes without having to depend on their web site (I this tested by removing the battery).
The web interface is a bit clunky and took a few tries to get everything the way I wanted, but once everything was setup I haven't had a single problem and I haven't met anyone who couldn't figure out how to work my somewhat complex system on the first try.
I saved the ROM file that is installed from the web site, so I can restore my entire remote setup easily in a few minutes without having to depend on their web site (I this tested by removing the battery).