I love the Sinus. I bag at least 3 at a time - usually in soft, medium, and hard plastics of various wear. I use the Sinus for everything between 150 ft approach shots to 300 ft straight shots. I highly recommend this disc!

I have tried a few overstable putters, but for some reason I keep going back to the Sinus. Mine is a 175g in zero medium. I just like the feel of the medium plastic. I use mine for upshotting and putting in windy conditions. There seems to be a love/hate relationship with this disc for many players. Most players despise the bottom of the rim as they say it feels sharp. So keep this in mind. I like the overall feel of this disc and it's flat top. I also like the 3 grip pads on the top flight plate. Some players might think it's gimmicky, but I happen to like it. It flies pretty straight when driving or upshotting with predictable fade. I feel that the glide is more like a 3 than a 2.  When putting, I putt with some heat on it in windy conditions. I tried the Slammer, Harp, Caltrop, Zone and Pig. But the Sinus is for me. 

I have been throwing a BT Medium Sinus since 2013 and I'm working in a BT Hard currently.  Why do I like this disc?  Utility.  It backhands and forehands well, it's got some overstability which constantly makes it finish nomatter what the wind is doing.  It doubles as a throwing putter with good fade.  Fantastic upshot approach disc that sits and sticks.  Great forehand get-you-out-of-trouble utility disc.  And it putts very well in the wind.  Once they beat in, they straighten out and fade less...but always stick when they hit.

Why not to like this disc?  The rim takes time to get used to and once it beats in a bit, that sharp rim softens and you never notice it.  It's definitely overstable with minimal glide, so if you don't have the arm for it, it's just going to die for you and if you don't forehand, it will be even less useful to you.

I hear people say it's similar to the Harp or Zone, but it's not.  It's definitely sorta odd.  The Sinus is closer to a mid than a putter, even though it's classified as a putter.  I think it flicks so much better than the Harp or Zone too.  Though I would suggest if your thinking about buying one, first borrow one to try out for a round.  You'll either love it or hate it...usually I hear when people borrow mine.

I have a love/hate about the Sinus. When I first picked it up I loved it, but the plastic beat in extremely quickly where I couldn't rely on it in the wind. For a long time I really liked it as my main approach disc, and the grips on the disc are pretty nice when conditions aren't the best which gives it a consistent release. I guess if I were to purchase new ones when they start beating in quickly it would still work, but I don't think my wallet would appreciate that too much. I know they did a gold run of these in a limited edition, but they're impossible to find without spending over $300 for them. If Latitude would make a run of these in Gold or opto I would immediately pick a couple up. I'm giving it the rating that I am due to my time using it, but for longevity it just doesn't work for me in my bag. 

Edit: I'm using a Discmania P2 in place of this disc.

Unique is a great way to describe this disc.  From the thumb pads to the rim it's different than anything else out there.  I used to use it for putts but then I found the judge works a lot better for me.  However it still has a place in my bag for those windy upshots and putts. 

I have thrown a Westside Harp for quite a while and I loved the consistency it gave me. The Sinus was made with that same idea in mind. It is quite overstable and will be really reliable in the wind and for any shot that you really need to control. I personally didnt find the "thumb pads" all that useful, but that is probably due to my grip. The underside of the rim is very sharp and can feel weird in the hand. For this reason I use the Sinus as an apporach disc where I can grip it more like a mid range. I would say that It has a little more glide than it is rated. It also seemed really touchy when throwing it at higher speeds. Unlike my Harp, I was able to flip the sinus over if I tried, but if you use it as it is intended (as a putt/apporach instead of a driver) it should serve you well.