Yamaha DTXpress/DTXplorer/DTXtreme

hello everyone,
I just recently bidded a DTXpress II on eBay, and I won it..
The pics of the drumset show the drumset is pretty new, I guess it 
hasn't be used much.  The price I will pay is 455 dollars, it's the 
first time I buy an electronic drum, since yamaha has stopped producing 
this model, I can't find any DTXpress II on the market, so i just 
wonder if this is a good price or not??
Thank you guys very much...
yang