Congrats on the Volt and the switch! Give those cigs to a homeless smoker. Nobody needs (and doesn't) need a smoke more...
I have all three SI batteries (all manual) and I too attribute a lot of my success in switching to them. They're all great pieces. I actually made the full resolution to quit when I first took a puff on my X2/T3 setup, just right then and there. I've tried other e-cigs that made me think I could make it work if I wanted to, but that is to say it seemed like something I was really gonna have to commit to in order to have any success with. With the X2, I was just like "Ahhhhhhhhah, well now! I can definitely do this." It was so good, I actually really wanted to use it.
They are all extremely durable and well-built. The colors look (and feel!) awesome. SI's cartos and T3's are the bomb. Prices are good, service is better. The spinner is my favorite battery by far. If I get 6 months out of it, then it'll get a perfect score from me.
Like, somewhere along the line, I will get a big boy mod or two, but I think the Volt Spinner and 78mm will still be my main batts simply because they rest on a good middle-ground between size and vapability. They're small enough to carry around and the vapor is still enticing enough that you won't want a cig. They're elegant and "just work." It's something you can just grab and vape on for instant satisfaction.
I think SI probably doesn't get as much acclaim as it perhaps deserves because they use 808 threading. Their products are at least as good as any eGo clone or 510 cigalike (better, imo.) I think more people would use them if they were 510/eGo threaded. It's not like your options are all that limited with the 808, though. Ask anyone who owns a Volt if they feel deprived at all by the thread type. While I do admit that you have to shop around at times, I don't think there is a single thing out there for eGo's and 510's that you can't also get for 808. And if shopping around is too much, then what are you doing buying e-cigs from online boutique vendors in the first place? But seriously now - you can just get adapters and go 1-stopping for eGo/510 stuff.
I think 808 might actually be slightly better under some circumstances. I think the standard resistance for 808's and 510's is the same, but the standard voltage on the two batteries is different. 510's are typically 3.3v while 808's are 3.7v. This must affect the performance to some degree.
Personally, I went with the Volt because it seemed like the superior product compared to all of these eGo clones and the company seemed very well-established. I know my Volt is the real deal and that there are people to help me take care of all of my Volt-related needs and concerns. And my Volts have been nothing short of excellent so far. Volt ...!