I recently purchased a Boss RV-5 which I like for the most part. I heard the Holy Grail is hissy and you must use the supplied power supply. The Holy Grail Plus is supposed to be better. I looked at the Digitech Hardwire which sounded good, licensed Lexicon reverbs and feature rich, but the Boss was 20 bucks cheaper and I liked the build better...they were quite comparable IMO. I would look at the T-Rex Tonebug ($149) or the Lee Jackson Mr. Springgy ($199). These are the best I've heard for a reasonable price. I already bought the Boss and I'm tired of buying and selling pedals, so I'm just going to hang onto it. I don't feel it colors the tone much and it is dead quiet. Just my 2 cents from recent experience.
I run mine at the very end after the delay. I haven't tried it before the delay though. I use the Line6 Verbzilla and I have been very happy with it. It sounds good out front or in the loop. I prefer in the loop if I can.
I am GASing for a Hermida Reverb or Dr. Scientist Radical Red Reverberator for my other rig though.....
Heard great things about the verb-zilla, but tried it and couldn't find anything to recomend it over the RV-5. Maybe SLIGHTLY "truer" spring sounds, but nothing I could be certain of hearing, and nothing that would make any kind of difference onstage.
I wouldn't bother with the holy grail, nothing to add to the equation, with far fewer sound options, and the risk of noise (2 out of the 4 or 5 I have tried DID hum!)...
You should like it. I only took the RV-5 over it because I didn't like the feel of the knobs and I'm not a huge Digitech fan. Honestly, I'm still on the fence about returning it for the Hardwire, but then I was introduced to the T-Rex Tonebug for the same price. I'm always second guessing myself...some form of OCD I think.:NUTS
I just bought a hardwire reverb the other day to try it out, with full intention of returning it. I was actually quite surprised/pleased, it has many usable presets and all are very tweakable to get the desired sound. I tested it through my deluxe reverb and the spring sounded very believable at the right settings, I even A/B'd it with the onboard reverb, which turned out to be surprisingly close. I could tell a small difference in the feel but I don't expect any digital pedal to completely capture that spring sound. I have to say I'm really digging this pedal, it's already found a spot on my board :AOK