What it comes down to is a lot of the high end mods are made by one or two guys in a small shop, they simply cannot keep up with demand. Even the full production model like the ProVari are out of stock at times. Getting on a list is a risk at times...ask the folks who spent money on the J-Box, at other times it works out well, I got two Chi_You's because I was willing to prepay and wait on the original lists. You have to watch several forum, not just this one, and when you see a pre-production list starting for one you like then make up your mind if you want to pre pay and wait a month or two. Other times like with the iHybrid you have to be Johnny on the spot when they announce a sale time.
There are a lot of very good production mods out there, The ProVari, Saber Touch, BAM, Silver Bullet, REO...all easily available. Buy a production to use now and get on a list later.
Just now I was asking that... I'm not about to plop down 200 bucks on something I might never have...
An Aga T is on the way, along with an EgoT control head. I can use the eVic tubes