The Topside series are the only squonk you'll ever want to own. Once you've used the top-fill system, you won't want to go back. The chip is accurate, hard hitting and will read low builds.
The mod is really well built, and the only weak point is the battery door. If you drop it from a significant height, they're easy to bust. That being said, if you don't drop it, it's an excellent battery door.