I did order an Enttec Pro. Is it overkill? Probably. Having tools that are known to work well is very important to me so I'll pay a few extra dollars for the comfort of knowing it will work. I thought it was a better deal than an iDMX. I was also a little jumpy because when I ask if it would work, the guys at LOR said yes, but we haven't tested that model yet.
I'll test the USB485B when my show it setup and hopefully it works the same. If it does, then I have a backup device for my LOR network and my LE units.
As far as xLights, I think it's a great option, but my controller numbers don't fit it's mold. I'm already spending a ton of brain work reworking my sequences to integrate LE units so I'm not at a point to explore xLights yet. As soon as the show is running and the snow flies then I'll have time to explore more.