Rx200 3 battery beast is a true 200 watt device that has temp control avg price 60 bucks then there is the cuboid upgradable to 200 watts going for arround 45 dollars both are really solid devices.Cuboid is relatively new so if there are bugs and such they havent wiggled themselves to the surface yet but for the price point and the user interface i dont think it really would be an issue as far as the rx200 its been out quite a well....tried and tested and firmware updates every 2-3 months.... so wismec listens to its customers....and its a middle of the road price....then you have the fuchai...60 dollar sigelei device...nothing fancy...straight forward menu...200watt capabality.... nice size and decent battery life....it all comes down to what you are looking for....the cuboid and rx200 have usb ports for firmware updates whereas the fuchai does not.....they also both allow for ss temp control...so if you use a triton, crown, or the ss herakles plus coils, you can vape them in temp control.... rx 200 for true 200 watt and battery life but your trading weight, cuboid for price point and ease of menu...but your trading the length of which it has been out to whether it will have bugs, and then the fuchai which is the in between of both of them that has the sigelei name no ss temp control slightly bigger than the cuboid slightly lighter than the rx200. I have both the fuchai and the rx200 and i will say that i am enjoying the rx200 a whole lot more than the fuchai....not only for just a change of feeling in my hand, but the different options, the longer battery life, and the better chip set. Ultimately the choice is yours though, Almost every 200w device that has come out onto the market has been reviewed by some big name youtuber if for nothing else showing its functions and capabilities. The rest is personal preference. And by the time you decide and get one...the next new and big thing will be out lol.