I too have dealt with SI quite recently and have no complaints whatsoever. My husband did a lot of research and decided this was one of the best vendors to buy from. (Just the fact that he even started using an e-cig is Huge! He ordered their top starter kit @ around $95.00 which included the passthrough.) I personally don't care for the passthrough, but to each his own.
I originally had the N-Joy e-cig, but recently purchased the Volt starter kit with the PCC. (About $65.00) The N-Joy does not have refillable carts, and the ones they sell are pretty expensive ($20 for five throw away carts!), plus I believe the quality of their atties has gone down aLot!
The delivery from SI was quick and everything worked right out of the box and the two 78s I order came already charged. So far, I am pretty impressed. I just placed an order for more carts cuz my starter kit only had five, and a bottle of juice.
I get good vapor and an easy draw from the pre-filed carts I got with my starter kit and am looking forward to a good vaping experince with SI. And the PCC is a Great idea for days when I know I will be out and about, ie: shopping, at a ballgame, etc.
I think you'll be happy if you go with SI.
Also, when my husband contacted them recently about an issue with one of the products, (I don't remember which one) they immediately sent a replacement and told him he didn't have to bother to return the original. That to me is Huge, cuz I Hate messing around with shipping things! So their customer service is good, too!