ProTanks, like everything made in China, have quality control issues...
Some leak, some taste terrible...
Mine is leak free, thankfully... And most of the heads I've used have tasted just fine for about a week, then I toss them out and replace it. They're cheap enough, about $1 each, depending on where you buy them... I personally don't mind the ProTank, and if you're getting the Tatroe bottom cap and Tatroe tank, what you are essentially doing is buying a heavily modified ProTank "Clone" that uses the same heads as a ProTank/EVOD. From what I gather, using the Tatroe Tank and Base plate will alleviate airflow issues and leaking issues. So you should be fine... Especially considering the craftsmanship from Tatroe is going to be leaps and bounds better than the craftsmanship you get from Kanger.
The thing is, especially with anything Tatroe makes, it will retain a hefty resale value. If you don't like it, just sell it in the classies. Somebody will gladly buy it from you at nearly no loss to you. That's one of the great things about the ECF community. Never be afraid to experiment, even if it costs a little bit of many... Nearly everything you don't like, someone else does like it, and will buy it from you.
I'm always looking for something new and interesting in the classifieds...