I will have to say Sigelei all day. I have done a side by side comparison on the T8 by Cloupor, the IPV3 by P4U, and the Sigelei 150 and out of those 3 the Sigelei at 150 was the most obnoxious which leads me to believe that the others aren't putting out true numbers watts wise. The T8 at 150 wasn't much different than the Sigelei at 100 watts and the IPV3 at 150 was like the Sigelei at 130 so my thing is if you are looking for a high power box mod that is regulated and aesthetically pleasing the Sigelei 150 watt is the mod you are looking for it performs wonderfully it is very accurate with the ohms checker, which wasn't the case with the other 2 choices. Good luck and I hope you find what you are looking for.