This review is going to cover the Tour Series Swirl and a D-Line Quake. 

TS Swirl - This is THE overstable mid range. It definitely has more glide than the numbers indicate. The Quake has an awesome push that will always fade out. Thrown flat, it moves forward flat for about 50% of its flight. It then starts just moving left (RHBH) before that strong fade to the ground at the last maybe 20% of the flight. It has been very reliable for me. It can skip when needed, does not care about wind, and feels great in the hand for backhands and forehands.

D-Line - This if you want to cycle. I carry both the D-Line and TS Swirl to cover different shot shapes. Out of the box, the D-Line is still pretty overstable but it wants to hold that straight path longer before that last strong bit of fade. As mine has been seasoning in, it's holding that straight push for longer before the fade. Wind is starting to move it some off the initial line but it has enough integrity to not burn over and really turn. It just sort of moves forward but towards the right some (RHBH). D-Line feels great for a base plastic and has been more durable than I'd initially think. This along with the TS Swirl have given me a great one-two punch combo that was previously held in my bag by a Fission and Prism Plasma Pyro.

The Quakes kicked the Pyro mold from my bag due to them just performing better than what I had. The PP Pyro acted for of an approach disc whereas the Quake really fits the overstable midrange slot exceptionally well.

I love the Quake for an over stable mid-range. This is great when you need putter or mid range distance on windy days. I have one in the bag always.

I was looking for a disc like this and found the Quake to be a perfect fit. The thing that makes this disc great is its ability to handle torque on forehand. In my opinion the Quake is the best forehand mid out there. I've tried quite a few. 

I thought this disc would be a "longer zone." This isn't that. However, I have used this disc way more than expected. If you don't have an over stable mid range I recommend you get one. The Quake should be one you consider.

Love this disc, it has more glide than what the numbers suggest. This goes way further than similar 5 speed discs. Very reliable.