eBay unit: its only 45wx4 most name brand cheap HU are at least 50wx4. the resolution is only 800x480 witch isn't much so picture quality wont be bad but could be better. does not show RMS. it has a SW out put but i dont see it having much settings for it IMO. only pre set tuning no custom tuning (EQ). 1 year warranty. but still no bad for the price.

Kenwood: this one allows alot more custom tuning for your system you can ajust the frequency's etc. depending on what you are trying to go for is the difference. if your looking to build a system you will need one like a Kenwood you need certain settings for your SW and speakers. you you just want a double din HU and are not looking to hook up SW or anything go with the eBay unit if you want to save money. its all up to you but IMO id go with the Kenwood. Kenwood is a good brand and its worth the extra money and you wont regret it if you get it. there's alot more you can do with it and it will last longer