This is one of the best threads ever, and the right group to help answer this ques. Searched for everything I could with google, hadn't found this thread, Just posted what's below in the synth listserve, then OldGearGuy directed me here, reposting below my original:
"Is 224XL (which I hear is dramatically better than 224, I think better converters for better sound) still THE reverb to have for vintage synth music? would I be better served with several smaller but still high quality units for the same money?
How does 224XL compare to similarly revered reverbs in its price range, like Quantec QRS, SONY DRE-77, AMS RMX16, or 480l with Classic Cart (the last being quite more expensive)? Does 480l with classic cart sound quite diff from 224XL?
---
WHAT I'M LOOKING FOR: The big question is, 224XL as my main reverb, or a few lesser units for similar overall cash?
I make music inspired by classic horror films, looking to bring out the warmth and tone of vintage synths to the max. Trying to up my game to near-professional recording levels, in part by switching over from plugins to hardware where it makes sense, currently use Valhalla on everything (and it's amazing!), but for some things looking for that extra 3D and transparent clarity without mud at high reverb levels that only hardware seems to provide (hands on interface also cool). I often record dry to capture the full bit of the synths, but with the right hardware, there's that transparency that allows it to retain the bite with the extra juice of reverb.
Here's an example of my tunes.
Started by buying pcm 70, then lex 200, sold both, to my ears could do 95% of what they do with Valhalla. Then I bought Ursa Major Space Station for 2k, and I'm blown away by how 3D it sounds, but it only makes shorter tail reverbs, but figure supplementing with a Stargate could give me a lot as my base setup, but as these are more character units, many have suggested a Lex 300 or 300L for full mixes. Also really like demos of DYNACORD DRS-78, similar in concept to the Ursas, and has this really wide 3D image if really limited in what it can do, def a character verb. Also can't see working without a spring for what I do, but looking for one that sounds more refined/plate-like, I hear Master Room XL-305 is pretty good for that. (Was also thinking about Oto Bam or the new Meris reverbs, but demos just don't seem as alive to my ears as some of these others, so I think I've decided against these).
But if I get all those (Ursa SST-282 and 323, Lex 300, dyna DRS-78, masterroom xl-305), that's a lot of cash, could have a 224 that I hear is the best for my type of music that I can get.
When I listen to demos, the 224 (few demos of xl, is the diff more clarity of sound?) seems a bit too dark and not as 3D as I'd like (perhaps too 'already done'?), the 480/300 more 3D but a bit too modern, can't find demos of 224XL or 480l classic cart. I like all the chorusing though on lex, but should I be looking at something else, like quantec QRS (but doesn't it try to reproduce real spaces) or ams (but isn't that mostly really grainy)? For transparency, PCM 92 or bricasti (expensive!) perhaps, but I'm guessing they also sound too modern, and I don't need or want my reverb to sound 'natural.' That's why I was thinking stargate 323, which is great for character, but perhaps less for mixes.
WHICH SETUP?
Setup 1 would likely be ursa major SST-282, stargate 323, Lex 300, DYNACORD DRS-78, master room xl-305.
Setup 2 would be lex 224XL, ursa major SST-282 (does a lot more than reverb), and maybe one other less pricey character box (likely spring, so master room).
Setup 3 would be similar to 2, just a diff center pricey reverb, like a quantec QRS, 480l with classic cart, etc.
Downside of setup 2/3 is no matter how great the main reverb, things could sound a little same-ish after a while, but with synths I've learned a few pieces of high-quality gear is nearly always better than a lot of 2nd or 3rd tier."