My friend and I have several of these. 1 of the 1 airhole version, 2 of the 3 airhole version, and 2 of the 4 airhole version.
Mini review:
+ 3 posts, easy to use post holes
+ Decent sized dish
+ Cap fits well, everything works well
+ I like the drip tip for some reason
+ Cap doesn't heat up quick, doesn't really require a delrin/teflon/ceramic/etc tip for sub ohming
- Bad post screws, they are aluminum and will strip + rust out. replace them asap. Go to the hardware store or something and get some stainless steel M2x0.4 screws with HD4 or HD32 head size. Kidneypuncher also sells these. Protip: Most fasttech cheap clone rda's use these screws, stocking up on them makes a lot of clone drippers more viable.
- Post holes could do to be drilled out, are made of chromed brass and not SS. Mine have never worn off of flaked so no brass is exposed.
- Lots of chamber room, mutes flavor compared to a trident or bully clone or something.
- Threading on 510 isn't the best. It won't thread onto my k101 (not the best 510 threads) but it has no problem with my nemesis clones.
4 airhole version differences: The finish is a lot better on this version. It's still a matte finish but it's more uniform and seems to be finished with something finer than the other ones. The airhole placement isn't bad and I haven't felt the need to drill mine out. I normally run it at .5 ohms with dual microcoils on cotton. If I were to go any lower I would drill them out. My friend drilled his 4 airhole chimbus and it doesn't leak juice or anything. I haven't had any issue with the coil placement, but it isn't an ideal atty for vertical coils if that's your thing. Logo engraving isn't bad, the clone actually stands out because the engraving is more exact than the real deal.
Over all the 4 airhole version a good RDA if you want to use dual coils and probably the best you can do for 5 dollars. I think the trident clone (which is 3x the price but I would consider it cheap) does everything this atty does but better (chamber reduction, copper contacts, etc) and the trident 2 clone will blow it out of the water. Still for 5 bucks I like having these things handy and I like the looks a lot better than the trident so I find myself using it a lot. For 5 bucks it's worth a shot, you can't go wrong. It's a pretty decent atty if you replace the screws.
IMO the 1 airhole and 3 airhole version (single coil) are inferior to the SS bully/era clones or SS phoenix v4 for flavor and vapor production by a long shot, but the 4 airhole version isn't a bad dual coil rda at all.