I'm a bit disappointed after trying the HD Cart reverb (tested about 10 presets with guitar and synth) after reading the superlatives in the websites description of it. Perhaps it's a different type of reverb modelling, or a vintage tone I don't have the ear for, but I don't think it sounds better than any I use, which includes Breverb (guitar), Valhalla (guitar) or Audio Damage (Synth)?