I have an old Bedini 100/100 DE. In my opinion, this is one of the best amps out there. I've recently had sent mine into Bedini for the upgrade. It cost me over $400 after shipping, but the upgrade did wonders for the amp (which reminds me that I need to call Bedini and see where my ultra clarifier is!). I'm so happy I decided to do the upgrade. I've tried many other amps, but I couldn't find anything in the sub $5K range that came close in terms of an amp that was smooth, warm, and at the same time, detailed. I just wish this amp wasn't 18 years old because I don't know what I'm going to do if it ever goes out completely! This amp may not be for everyone because I think some may find it a little dull, but it's the perfect amp for my ears. Take a look at www.bedini.com for the upgrade package. I know that $400 is a lot to pay for a upgrade, but if you can pick up a 25/25, 50/50 or 100/100DE at a decent used price, you'll have a hard time finding anything even close at the price for the upgrade and amp- Not Pass Labs, not McCormack, not Threshold...