I happen to think the ER-5 is sexy as hell to look at. Mind you, I prefer naked bikes.
The main point is I'm in love with my ER-5. It is not quite at sports bike performance but it's pretty close to it. Being a twin it definately has an advantage at lower revs. There is an even spread of useable power across the rev range, it handles beautifully and has a comfortable riding position.
Drawbacks 1. Anything over say 150kms will make you start to feel like a windsock, but that's the price to pay for not having dinky little fairings on your bike. 2. Compession lock ups will take you by surprise for a lttle while at first.
Take a realistic look at the bike. Don't be off put by comments describing it as gutless. These are comments from people who'd compare a 498cc twin to a ZX10R. Not an intelligent comparison. A more realistic comparison to say a GS500 will display the Kwacka as a superior bike. Take it for what it is on it's own merit. You won't see ER-5's winning many races because the fact is, it's not a racing bike. As an urban assault weapon however it shines above the rest. As a machine for touring and weekends on the twisties, I've also found it to be ideal.

Little black duck upsets easily. Reassure and give beer.