I throw Trackers. I currently bag one OOP ESP Tracker and one older stamped OOP Z Tracker. I also like the current production run of Z Trackers, but for me it is just to much overlap to bag them all.
I treat my ESP Tracker like many treat a Firebird. While not quite as stable as most Firebird runs, it serves a similar role for me. I have other higher speed discs that are max overstable should it be required. The ESP is prone to slowing down in midair more quickly than any of my others. I would put the ESP somewhere between an average Firebird and Eagle in terms of speed, stability, and glide.
I treat my Z Tracker like most would use a Teebirds or Eagles. Great all purpose disc for all distances except for true max distance drives. The older run that I bag is heavily worn in and very domey giving me a lot of extra glide compared to production runs. I have no idea if that is more due to the production run or level of wear. I'm not going to experiment unless I lose/destroy this one. Great disc with a lot of turn and a lot of fade. Not great for super straight lines, but excellent at carving curves into a tight fairway. My go-to driver for more holes between 275-350ft.
Great disc that gets very little love. Overshadowed by more popular molds like the Teebird, Eagle, or even Discraft's own XS. Hard to say why the disc gets so little love. The slot it fills is integral to most players' games, and it is a very important choice. I'll give it all the love I can. I hope the disc never goes OOP completely. I'd even love to see some of the other plastic choices come back making buying far easier.