Summary: I was really excited to listen to this bad boy after reading reviews on this site. I needed a portable unit for listening to outside, so didn't want to break the bank. And I also didn't care about having a battery option, because there's a plug nearby and I have a small battery powered device already. I guess I was expecting a little more based on all the 5 star reviews. I fired it up and it sounded pretty good, I just wasn't blown away by it like I thought I might be.
Conclusion: The iK501 was perfect out of the box although I feared the angle of docking connector would be a problem. (when docked, the phone stands almost straight up, and can lean slightly forward "prying" pressure on the connector) My intuition was correct - after a couple months of docking/un-docking, the connection between my iPhone & the iK501 began to have connectivity problems.