Very good product.
No driver required under Win7 64 bit. Chip-compatible M-Audio, excellent stability (motherboard ASUS P7P55D-E LX LGA 1156)
Turned my Firewire external sound card with or without external power by choosing the port Firewire 4 or 6 pins.
No need to spend more.
Serious seller, sending fast and neat package.
100% success.