When I first tried Glaceverb I put it on the shelf for a while. Then I heard others say it was good for vocals and you know what... They were right!
Glaceverb has a silky smooth sound and the presets are very good. I used Vocal - Preset 1 today and love that subtle delay. I also loaded a 2nd Glaceverb to use on drums and was pleased to find it only increased my CPU on my 2.4 gHz processor by about 10%.
It also has a lot of different presets with a variety of sounds FX like Metal Factory that I really like. The GUI is very slick as well, although the little sliders are sometimes hard to adjust because of their size, but they're manageable.
My only question is why is this verb free? To me it's good for a lot of applications. I still haven't found the setting I'm looking for when used to emulate solo concert piano. Although I might just need to play around with Glaceverb a little more with the piano and find out all that she can do.
My advice would be to "Give her a spin." I think most will find Glaceverb a refreshing change that will sit good in a mix!
The best free reverb IMHO. It can compete with other commercial options. To get all the juice you have to play with the controls and not use the presets. The presets are just a starting point for those who do not want to invest a lot of time. This one is an example of what it is possible to do with Glaceverb (with mi own configuration):