Well, I just had to chime in here. I can see both sides of this argument, as I've been there either way... I started with a Phoenix dripper and AGA-T2 as my first rebuildables. The Phoenix was easy to rebuild, but the AGA was a major pain in the ... because of the design. It can be set up right, but it can also cause alot of headaches... I ended up modding it in a couple ways, including drilling out the wick hole to accommodate a fc-2000 ceramic wick, and drilled the air hole to 1/16". From there I bought an AGA-S, IGO-L, and KTS mod. They all worked well enough for me, but I was still looking for more.
I purchased an RSST and Diablo hybrid within a couple days of each other. The RSST performs quite well and is easy to set up on, but the center post is not very conductive, and I had juice slowly leaking down the center post to the 510 connection. To rectify that, I procured a silver plated center post, and used an insulator from an AGA-T2 and another washer to seal the center post. Now it works pretty decent. On the other hand, my Diablo hybrid arrived in my mailbox with a perfect polished finish, and was just begging to be set up. There was nothing I had to do other than to roll a wick and wrap a coil. The setup was the easiest I'd experienced at that point, and not to mention the build quality, which is excellent.
My latest acquisitions have been an Arrow atty, Kayfun 3.1, and GP Paps LUX. All of these products have exuded quality of build and functionality. To me, the greatest difference between Chinese made vape gear and higher end gear, is the quality of materials, machining, and design. The Chinese are obviously just copying well known designs, and not very well at that TBH. Higher end devices and attys are designed by people who actually use them. This gives them a distinct edge in producing a product that will require less maintenance, modification, and just provide an all around relatively hassle free experience. They also stand behind their products.. so if I ever have a problem with my PAPS for example, I can just PM perseas on this very forum, and get customer support! There are no Chinese products that come with a warranty, and all are sold as is.
Don't know what more I can add.. If you can't afford good quality gear, you can still get almost the same vape out of it. Personally though, I don't mind spending a bit more to get well made products that were designed by vapers, and made for vapers. To me, it's just less hassle at the end of the day!