ScienceHD Documentary HD CHDbits?

What is the good tracker for HD documentary other than ScienceHD? Do someone have an invite for those and would like to share it with me. I use it personally and have good Internet connection with a desktop turn on most of the time.
Also for CHDbits, how is its documentary selection compared to sciencehd? Can someone send me an invite also or inform me when it will be open for reg?
Thanks

sciencehd isn't a good tracker in my opinion mate
you can find documentory hd stuff on just about all the hd trackers out there

i didnt like it and just let my account die but to each his or her own.

ScienceHD does have a lot of exclusive content because it's specialized in it. However, it looks like a died city and the staff sucks..