Zanden 3000 preamp - how's it holding up?

Hi,

I'm seriously looking at this preamp(used) to partner with my Karan monoblocks. What concerns me slightly is that it has been on the market(more or less unchanged) since about 2004. Is it still holding up against the competition?

If anyone has experience with this preamp and would like to share their thoughts, it would be much appreciated. Other potential candidates includes Conrad Johnson GAT, Aesthetic Eclipse and Einstein The tube.

Thanks!