What RNS-E Unit to get?

ooo cool how much and what is AMI ??? the fella on the ebay link said he let me have it for 400 fitted , would that be a good unit to get ??
 
Personally I wouldn't touch the RNS-e units on eBay. Could be stolen etc. Ami is audi music interface, search the forum for it if you want to know more.