They leak like crazy and normally dont come with a stand so its a pain filling up the bags. With some duct tape, the leaks can be fixed, but its still not something I would buy. Currently, I use an NO2 and happen to like it. Its still fairly new to the market and Im quite skeptical about how it will hold up. When it comes to vaporizers, it really depends on what situation you will be using it for. If its just for you, a bag style vape is always going to be a pain. But if you live in a house with a bunch of people that smoke, bag vapes are awesome. Again it depends on what you want out of it. If you have cats, I stongly suggest avoiding bag vapes.
For further details, I would go over to FC forum and check out what everyone says.