picking on the hi-fi crowd as one crowd I'd avoid that, much to read out there, written by EE's. Sure, if you dont understand shit, they rip you off like no tomorrow thats how it goes. On the other side of the coin, I bought the 1994 Prism dScope from a former newspaper writer, for about 50 Usd on ebay, the new version goes for 12000... The TDA1540 and 1541 are bugged, the dynamic element matching never worked out as expected. The only top tier gear using TDA afaik are the Quantec ... R2r, Laser trimming is better. Double precision, phase optimised oversampling is also good ;D