I have the Focusrite Pro 24 DSP that has this built in and to be honest I used it a few times and thought it was pretty gimmicky and I haven't used it since.
Wish I'd gone for the plain vanilla Pro24 now as I don't like the 'comfort reverb' built into it either, it's quite poor and you can't adjust it. So I haven't ended up using either of the extra features I thought I would.
That was a couple of years ago, and I've treated, measured, and tweaked my room since then using a measurement mic , Room EQ Wizard and some help from the acoustics guys on Gearslutz.
My favourite thing I recently got is a Avantone Mixcube..that shines a whole different light on your mix. Sometimes it's really surprising what it reveals. One of the strange things is how you can make fader moves on it that sound quite obvious, but are virtually undetectable on the bigger monitors.