Reefermans Viper

Hi Guys...
I know Reef is not selling seeds anymore (at least the way he did before) but I bought some beans of him about 2 years ago.Then I have been travelling,and when I came home I had forgot I had the seeds,but when I found the little packet in a corner in my fridge recently,I remembered.It was the idea I should have bought some C99,but they were out,so team Reeferman sent me some "Viper" (Burmese Pure IBL/Blackseed,Mex Sativa IBL).
Back then I was so pi..ed because I got those Vipers,+ I got some freebies,Bohdisattva,and Cherrybomb II for free!
But today I start to realize why everybody in their forum told me Viper was a much better deal than C99.Today after having tried to find information about these 2 strains (Burmese Pure,and Blackseed) I can see this is some serious Chronic.It should be very Sativaish and good smoke.
Does anybody know "Viper"?If you do,or have grown it,I would love to hear what you know about the strain.I have just popped all 8 I had and all came up.
Also Burmese pure I would love to hear more about.It seems to be a strain you dont see very much anymore?
Thank you in advance.:)