My 20 degree long/wide Mamba works very well. Nice item with quality workmanship. I sleep hot and have yet to be cold down into the lower teens.
I do mate the Mamba with a HG Incubator UQ(another fine item with superb workmanship).
Both are high quality items. $$ might dictate the selection$$
Both items are rare on the For Sale forum here at HF.
"The music business is a cruel and shallow money trench,a long plastic hallway where thieves and pimps run free,and good men die like dogs.There's also a negative side"
Hunter S. Thompson