1. 1/3 of price of volcano
2. Many attachment methods
3. Ease of use (Had reports that reloading the next bowl was slower and more complicated that with the extreme)
The only thing I enjoyed about the volcano was the solid valve setup, mostly because no vapor leaks, and the overall experience is more enjoyable than the straight tip from the Tower extreme.
I was trying to find out if there was ANY way I could get something like that for my extreme, and luckily I landed on the Easy Valve for the volcano.
The easy valve was 120 from gotvape.com
When it arrived, there was a metal screen that needed to be popped out, and then luckily the Tower Extreme's tube slide into the easy valve, almost perfectly, quite snug but thats what I was looking for. On the other end, I could now hook up Easy Valve balloon bags.
So, for me, this was the overall best option for a grand total of $340. I also changed out the easy valve bags leaving me with options for three different sizes.
I was looking for a thread like that but couldn't find one, so I hope this helps someone out.
Here are some pictures.