i just got a ultra module, it was from the eden plant. it had E/H tubes in it, i have never been a big fan of those, however on some amps they can bring a edge back to a otherwise dull amp. anyhow, i felt this module had to much hi end gring and buzz. i loaded up a set of tung sol 12ax7s in there rok the gain to about 1300 and whoa i killer 5150 like ephoria. i ma running on my rm100 2 inside 6l6 jj's and outside jj el34l's biased hot, and it does nothing short of rock. i use the sl+ 1086 and the ultra, i have 4 guitars all with floyd rose and d tunas one and olp flame with evh 1 ibanez limited edition with upside down headstock and 2 jacksons, i feel they are all like stock cars b/c theres nothing stock about a stock car heh!! i have owned 3 5150s and the ultra with this setup is killer. the amp regaurdless of what module im using picks up all the differences and nuanices from all the guitars i have. i think i need to work for randall as i think this is one of the best setups ever and could really get behind this product.