I'll keep this review short. Flies like a perfect Teebird, feels better than a teebird, goes further than a Teebird, gets a cleaner release on both backhand and forehand than a Teebird and lastly, is more forgiving than a Teebird (especially for lower arm speeds and beginners). So, if you want something in the Teebird slot, but the Teebird doesn't work for you: this is a disc you should try out. 

This is the best disc Kastaplast has made since the Berg.  It is a slightly overstable 7 speed that can just bomb, it is like the Innova TeeBird except it goes farther and glides more.  When thrown flat this disc will offer a small amount of turn, allowing for some easy distance, before a reliable fade at the end.  Even with the immense amount of glide this disc seems to have, it can still hold up into a wind pretty well.  Kastaplast absolutely nailed it with this disc.  

Kastaplasts first seven speed and to be honest they nailed it. It's extremely true to its numbers and will push further than you think. Fantastic for backhand shots 300+ feet. A little flip up and drift(once you break it in a little) and a nice reliable fade and finish. I currently bag two. A nice and beat in poison green and a newer pink one thats a little more overstable than my seasoned one. If you're looking a Teebird but want Kastaplasts K1 the Idog is the disc for you.

Best 7 speed I've thrown in a while. Perfect for tunnel shots and even has the stability to manage windy conditions. Everything you need in a fairway driver.

This disc is great. Put it on a little hyser and it will filp up to flat with a little fade at the end. The flight numbers do exactly as they say. The K1 plastic feels great as well. Highley recommend.