Sorry to bump a fairly old thread, but I recently bought that 510 kit that you referenced in your first post. I'd have to say (being new to vaping) that I find it extremely wonderful. The battery has lasted me at least 3 days so far, even with a lot of use. Their brand of e-liquid leaves something to be desired, but isn't completely terrible. For the $50 or-so for the kit, you get two complete e-cigs, which isn't bad. The battery charges fast (about 1-2 hours) and lasts for a while. If you're new to vaping like I am, you won't be disappointed. It's not the top of the line, but I'm happy with mine so far. The battery has "SMOKR" label on it, which after research, is made in China, so if that bugs you than you may want to avoid it. Filling the cartomizer was a bit of a pain, but just be slow with it, and let it absorb slowly (it took me about 15 minutes to fill, and I left it overnight to avoid problems). Just thought I'd throw my two cents in, with it being a great price for a good product.
Bottom Line:
Good product, great price. Recommend for new vapers (like me).