The B-5R has the same clean circuit as the B2RE - unless you like that tone, steer clear! I have never even played the Berg 610, but after hearing everyone rave about it, even I would buy one without ever playing it. The SVT 410hlf (i used to have two); let's say I am glad I don't have it anymore. They went lower then low, but had next to nothing in projection or midrange punch. The subsonic 30 hz low end was 100% useless with my 5 string. All that frequency does is eat up extra amp power to put out a sound that I and my bandmates will mainly feel and not hear.