Rogue Metis compared to Rogue 99

Has anyone compared these two? Would I see a large improvement with this preamp upgrade?
The 99 is discontinued. It has been replaced by the Perseus. I have gone from a Metis to a Perseus, it is a BIG upgrade.
not sure that is correct. Both are listed on their website. seems like their 2 different animals. Fruff - responded to your other thread re: Metis thoughts.