Mackie HUI Controller - thinking of buying one

[Superhuman]

Hi there,
I'm looking at a second hand Mackie HUI Controller for adding to my home setup. I'm using Cubase SX3 so this should make my life a lot easier (I hope).

My Newbie question is... I currently use an M-Audio Delta 1010 rack mounted soundcard, does the MAckie HUI interface directly with this unit before goiing into the pc or does the soundcard become redundant?

Anyone with one of these units that can advise me on whether they are worth the money or not, feedback would be much appreciated.

Just incase this is important, I use CUbase SX3 on a pc based system, fiddling with the mouse does my head in - I had a Tascam US428 before, tactile controlls are what I want. I record mainly live guitar/bass but also use a fair few VST's.

THanks!!!