Backert Labs Rhumba preamp

I am thinking of going to an active line stage for sometime now. I have a separate thread for that and people have suggested some good choices. The reason for this thread if that, while I have all along said that  don't want tubes in the system, a few have convinced me that I should try tubes in the system, especially with ProAcs.
With that said, I researched a few tube preamps, that have XLR out and the Backert Labs Rhumba is the one that has only 2 tubes, which makes me comfortable to "deal in tubes".

I would like to hear from Backert Labs Rhumba owners who moved from Solid State preamplification to this preamp. What are the differences you heard? Any improvements?

I read a review on the Stevehoffman forum and the user mentioned that there is a "hum" in this preamp. This bothers me and hence I decided to check on this forum, if anyone has experienced this with the Rhumba in their system. One poster on this forum also confirmed the "hiss":

So I was wondering, if there are any users who have recently purchased this preamp and what is their experience with the hum/hiss issue.

BTW, I blame Ralph of Atma-Sphere, Almarg  and my dealer for making me consider tube amps :-) Can't believe I am creating this thread.

Congrats @milpai 

Welcome to the Backert family, and thanks for wonderfully articulating the sonic benefits that the Rhumba preamp brought to the table for you as it did for us other happy owners!

I have my Backert Labs Rhumba 1.3 paired with my Pass Labs XA-25.  It makes a sublime combination!  
@rdoc,Good to know. What are your source and loudspeakers?The Rhumba throws a huge soundstage in my system.
The Rhumba acts as a measurement tool for me. If I am able to listen to CDs at 10 o'Clock position, it tells me the recording on the CD is not dynamically compressed. If it gets loud by 9 o'clock position, then the recording sucks.
I am absolutely thrilled by this preamp.