I dig this old thread from the grave with the same question updated for 2019.

I use my trusty TC Electronic Impact Twin for many years now and it's got great things going for it. One feature I like that I didn't thought about when I bought it was the integrated reverb, which is really good and helps quite a lot when recording voices and acoustic instruments, as the artists feel more comfortable with a touch (or a lot) of reverb. I wouldn't want to lose that feature

The Impact Twin works flawless, but has one drawback, it's Firewire, a dead protocol. None of the new motherboards come with Firewire, so I have the same question regarding hardware monitoring reverb, which interfaces have it? I don't want to use software, because I usually track voices late in the production, when there are many tracks with many effects already and low latency is not always a possibility, so hardware is a must.