Hey has anyone ever bought one of these non RossTEC VAGCOMS?

SG02 VAG TACHO USB 2.5 for VW / AUDI - DinoDirect.com
VAG MaxScan VAG405 Code Reader OBD2 EOBD CAN BUS VW Audi SV02 - DinoDirect.com
DealExtreme: $32.18 U281 CAN VW/AUDI Memo Scanner for Volkswagen/Audi
Parts Bin - Auto Parts and Accessories Catalog - equus - 1997 Volkswagen Equus