Had to chime in here. I've had the Bluebuds for around a year and a half and absolutely love them. Once you've had earbuds like this, you'll have a tough time imagining how they could possibly get better. I used to use the Klipsch S4i and loved them too, and while their sound quality may have been a little better, the quality of the Bluebuds far exceeds what I expected of them.
But here's my one gripe: the rubber tips don't keep them in my ears, and while the fins help to keep them in, they're uncomfortable.
Solution: Comply Foam Tips. No need for the fins anymore, and they've never once fallen out of my ears, even while working out. And they're WAY more comfortable and noise isolating.
I order them from Amazon (
http://www.amazon.com/gp/product/B002P7EKAM/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1) - come in 3 packs, probably need to order new ones every 6 months or so (that said I use the Bluebuds heavily - maybe 1.5-3 hours per day, so the tips may last longer for most people).
Take a look at the headphones Comply uses to show off the tips on their home page!
http://www.complyfoam.com/