I feel like I've found some kind of disc golf cheat code. This disc just does whatever you ask of it. I thought it was maybe just luck in the beginning but in the short time I've had this I've rang up more chains and basket hit 50-200ft than I ever have. I put this disc in the hand of a fellow ultimate player who is new to disc golf and he had the same experience. He instantly went from whiffing to hitting chains. 

This may only relate for people coming from ultimate but this disc has such a natural feel out of the hands. This is my disc for any tight gaps, odd angle putts, anhyzer putts and approaches, drives within 225. That just with the retro plastic. I ordered and opto and I want a moonshine when they come in to handle some additional power. 

This is not my go-to putter, however. This disc has a little too much glide for that duty in my bag, at least for putt under 45ft. 

I got two of these from the 2019 Trilogy challenges I did and had them in my bag for a while before deciding on using a Westside Shield instead.

This is a pretty fantastic disc. A bit more understable than I am looking for in a putter but this could be the all purpose putter people are looking for. The Keystone has a super consistent flight as  a throwing putter and a great 'in the hand feel' putter to make any level of player feel more comfortable running long circle edge putts. If you're looking for a super glidy, understable, well rounded putter to add to your bag then this is your putter.

I know a lot of people who putt with these, but I bag one as a turnover approach disc or off the tee on short holes. It's super glidey, so I only use it for approaches of 100ft+ (it has a tendency to fly past the basket if you're not careful with how much power you use. The plastic is ideal for winter conditions. It is easy to throw when wet out, and is not slippery at all. The retro plastic isn't super durable, but I'm very happy with this disc.

Update:  The 5 glide is accurate.  This thing wants to stay in the air.  Once it gets spinning it just seems to keep going.  Makes long distance putts easier, but also has the potential to leave long comeback putts if you miss.

It's also very easy to flip it up to flat when thrown with hyzer.  It sits up, rides, and then just gently descends.  It does not fade hard at all, and makes for an easy landing.  

I am mainly using this as a throwing putter.  Easy to get it to flip up, and also fantastic for a flip to straight to turnover at about 200-220 feet (but never with a headwind).

The Retro plastic is awesome.  It's grippy, though in colder temps it does become slick.  So far, the plastic is proving to be durable.  Looking forward to trying the Opto version.

If you are looking for a reliable putter that is not too overstable, handles moderate power, and has a shallower feel, this is a disc worth trying.

So good. I got it at trilogy challenge. Hated it. Then I forgot my usual putter one day and it was in my trunk. Now I have 3 of them, it added consistency when I had none. 

Shallow rim, flat top, grippy plastic. 

So good. 

This thing is my new putter since the trilogy challenge and it’s really has boosted my consistency inside the circle. I used to use the marshal from dynamic discs but they were a little too stable for my putt, so the keystone is perfect since it flies much straighter with less effort and has a similar feel in the hand. With just the littlest bit of pop in the wrist and a little extra air it just seems to float for days for those circle two putts. I thought it too understable to be a driving putter but threw it off the tee a few times today and it just flies so straight so effortlessly especially for those 150-200ft shots. Just ordered one in the moonshine plastic for a bit more durability for throwing, and found a couple in zero medium plastic for added grip for putting. 

Beadless and slightly understable, this is a great putter inside the circle, and for anhyzer approaches. I normally putt with a discraft roach, and during a trilogy challenge I had zero issues transitioning to this putter. I like the plastic as well, and it provides enough grip to putt even when it's wet. Nice disc, and a pleasant surprise when it was the only putter I could use for a round.