I've had a sigelei 75w for a few weeks now and it's fair to say I love TC for dripping. The thing is, the sigelei feels cheap as f*#k! The butttons rattle, the lable slides off and the plastic used for the body is horrible. I have a mvp3 pro which is in a different league of quality. My question is, what should I replace it with? I don't want to spent over a £100 so the sx mini, sx dual and vapour flask etc are out of the question. The Sig works really well, but I don't know what chip it uses. Some say its a Yihi, but haven't found any proof of this.