There are bad reviews, and defective products, for everything that is made by man. More good reviews than bad on the VTR.i read couple of bad reviews for vtr, http://www.e-cigarette-forum.com/fo...annot-adjust-voltage-wattage-need-advice.html
The VTR is a great mod in my opinion. Though I love the sigelei 100w. Though with the sigelei you have to make sure you have at least 2 good 18650 batteries and a charger. The good thing about it is that if you want to upgrade to a better tank in the future, or even use a rebuildable dripping atomizer, you can. It has the capability to go down to .15 ohms. It's a solid box mod. Be wary of the fakes though. I've known a couple of people tell me the connections on theirs rotted out and you wouldn't want that to happen. So i suggest getting it from a reputable dealer. With your aerotank though be careful not to set the wattage too high or you will fry your coil.
The VTR is effectively obsolete. The Sigelei 100w is a good choice with major headroom for someone coming from an SVD. Another choice might be to get a pair of ipv minis and use one while the other is charging.
I agree that not everyone needs a 100w device.How is the VTR obsolete, when he's not even maxing out the capabilities on a SVD? OP said he really liked how the combo of 10w on a 2ohm coil was working for him, and wanted another such device for his KTs. Not everyone needs 100 watts in their pocket.