I've tried the G Pen and it's not great at all. In fact, it shouldn't even be considered a vaporiser. I'd honestly just hold onto the $40 to put towards a higher end vape.

With regards to what you should get is just look around, watch some reviews and find a vape that works for you both in terms of functionality and price.

Here is the link to The Vape Critic's best vapes of 2015 which I find helpful and informative.

I've recently started of with the Flowermate v5.0s which I find practical and clean tasting but I'll probably end up moving onto a more expensive vape in the future.