Before I purchased a Phiniac, I ordered a Smoktech tank. When I opened it out of the packaging, I took one look at it and put it aside into my "Give to someone who will appreciate it" pile. The thing feels so flimsy.
I had awful experiences with my SmokTech tank, and recently their cartos as well.
Tho my Phiniac is awesome. The tool is a MUST. If you have a slip drip tip, this can also be used for sliding as you can use the DT when sliding the carto up. Stick the DT down the hole, insert it into the carto, then push the carto up to its desired height...this saves the O rings from getting beaten up. The Phiniac has very tight tolerances and so the cartos will be snug..having the tool or a slim DT on while sliding the carto through makes it require much less force and doesnt temporarily deform the O rings, which will wear them out over time.