The Sentinel is a often coveted disc in its old San Marino tooling, but the ones available now fly a bit different. Even though they are a bit different, I find the Sentinel to be an outstanding overstable midrange option. The Sentinel is a faster midrange that you can really put some power on without worry of flipping. Though it is stable, it holds a straight line for sometime before finishing with a strong forward fade. The newer versions aren't quite as overstable as the old Sanny ones, but it has plenty of fade to hold down your overstable mid spot. They are very comfortable in hand, with a shallow rim (cobra rim), and a slight dome on the top. Overall, this is just an outstanding disc. 

As someone else said, it's the MF'n Sentinel! What a great disc. This midrange can take some beef when thrown and will carry an amazing line from there. This disc can potentially replace fairway drivers because it's that long and accurate. At least in my experience. If you have fluid form, this disc will listen. One thing though, the Quantum plastic can be a bit domey, but break it in and "Man oh man!"

2013 USDGC Champ Steve Brinster ' s favorite mid-range!

The Sentinel - MF (the MF stands for either mid fade or more fade depending on the run of the disc) is an overstable mid that has been on the market for a hot minute, and is one of Millennium ' s top selling molds...All for good reason.

While more recent runs of Sentinels have come out pretty domey, they always feel good in the hand. Very easy to fan grip, power grip, fork grip and all varieties of sidearm shots. Millennium ' s plastic blends are the same as Innova ' s (Sirius=Star, Quantum=Champion, etc.) Though their metal flake does tend to be quite a bit more sparkly than Innova s metal flakes. That's all cosmetic though.

The Sentinel flies great. Super straight initially, even with a large amount of torque, and a good, forward-penet rating fade at the end. An excellent power throwers mid that is reliable, throw after throw. Great for power hyzers and short forehand rollers as well.

If you're looking for an OS mid, but discs like the Demon, Drone and Gator have too much overstability for you, then the Sentinel is one to get.

One of the best overstable mid ranges on the market. Try it in Quantum or Sirius plastic. Great in the wind.