I mentioned in another great Harrison thread (there are two) that I jumped on this and I am happy I did.
The XT-EQ is also excellent. I am still so impressed with how you draw curves both on this and the mastering EQ. I have got all the Harrison plug ins and I must say I like them a lot. Now the Reverb is something else. At first I found it to be good only but after watching a great (Harrison) video on it I am able to extract a pretty decent sound out of it. It is marvelous for small rooms, the way the presets are selected and edited is very simple and effective. Fast is an understatement. The delay is also very very good and can do a lot of really useful delay stuff.
The mastering multiband comp is also a beauty. It is very controllable especially in how it limits the gain reduction in each band. You can get it bearly touching your mix yet still adding that sense of compression and attitude. It is very transparent and leaves your mix sounding pristine.
If you think about exporting at the right time your stems and tracks with any special DAW processes attached then use Mixbus for the final mix using all their pluigs, all the built in EQ and dynamics on all the tracks and buses, it is powerful combination.
I would love to be able to open the Harrison reverb up inside Studio One but that is a no go unless Studiio One decides to become LV2 compatible. But it is not hard to add that Harrison reverb later either.