Anybody Tried These??

I am pondering the purchase of an aftermarket power cable for my amp. I have been using the stock cable to this point. Here on Audiogon, I have seen these for sale:

AudioQuest AC15 H/W Power Cord

If you have experience with these, can you tell me if it an improvement? It looks like they're last year's model, but that doesn't matter to me. Effectiveness is what counts.

Thanks in advance.