I have a Delta 1010 and it's been a great card for me. I assume the 66 is similar with less inputs.
I have read of some people that have experienced crackling sounds with Delta cards - but it seems that most have been able to get rid of it through a variety of tweaks (e.g., disabling ACPI). FWIW I've never had any bad experience with mine.
Gotta agree with Dave - the Delta Control panel needs an overhaul but after a little bit of a learning curve, you never really have to bother with it. I only use mine to mute a mic once in a while.