Yamaha DTXpress/DTXplorer/DTXtreme

Hey guys, I'm new to this forum, and new to e-drums. I have been 
playing drums for years, but just now getting into this.

I have picked up a DTXpress 1 from Craigs list for really cheap. I 
wanted to buy a couple more pads, and ran across the AlphaDogV pads on 
ebay. Has anyone tried these or heard anything about them?

Thanks, 

Nathan