Minor operational grumbles aside, ValhallaRoom has it where it counts with its fabulous-sounding reverbs. Large GUI that's not resizable. Preset system could be better. Some minor functional ...

It's available in AU, VST and RTAS formats for Mac, with a VST version for PC users in 32 or 64-bit flavours. ValhallaRoom's GUI is an intentionally no-frills affair. There are five vertical sliders ...