LavaTube is a good starter VV, especially considering the price. (not good with 1.5ohm cartos though. Use 2.5-3ohms)
I have one and I'm very satisfied with it. You just need to have realistic expectations.
I was not impressed so much with Smoketech DCT, so will be getting a J-tank for my V-Tube (Lavatube).
I suggest looking at Pbusardo review on both the Lavatube (the model he reviews is called something else, like VVM(?)) and the J-Tank. Pbusardo has some of the best reviews on YT and is very thorough.
Of course, if money is no object, you could jump in with both feet and get a Provari or Darwin. They're way better than the LavaTube, but costs 4-5X as much. Someone will recommend them soon, so I figured I'd mention it.
For a little more than a LavaTube, you can go with the Tox Cannon. It's like a Lavatube with few more bells & whistles, but it's a new product, so relatively untested in the field.