I use the DiD and have found it to perform quite well. It is my first Gen. style rebuildable, and it's a good introduction to the type. Is it better than my Ody/Pen? No, just different. I like them all equally, and the craftsmanship on the DID is on par with the GG stuff. Yes they'll leak if you lay them down, but I've had no trouble what-so-ever with leakage under normal use. I personally can't want to see how it looks on my new GGTS
With that said, I do find the Ody/Pen slightly easier to setup, and you don't have to worry so much about hotspots and shorting as it's using silica instead of SS.
It basically comes down to the fact that I enjoy tinkering and building these atomizers, no matter the type, so wanted a taste of both kinds. Truly love them all for different reasons!
Anyway, back on topic. If you're wanting to get a GGTS in a reasonable amount of time, I'd go ahead and place an advance order. Really is your safest bet, and much less stressful than stalking COV waiting for them to sporadically show up in stock