Can't say I've tried the Denon's, but I'm very happy with my (2nd - left 1st pair on a plane - doh!) pair of SE110's and I paid significantly more than £55, so it sounds like a bargain to me! A very natural sounding pair of earplugs IMO, plenty of taut bass, but not overpowering, and certainly allows a lot of detail through. Cable quality good (nice and thick) and there's no sign of any wear despite daily use cycling to work. The split cable i find very useful, meaning i can use an iphone mic cable for cycling and general use, then a v short ipod shuffle connect directly to the Y-piece for gym and running. Noise-blocking seems excellent too (they've put in good service in a very noisy gym and are excellent for traveling - my first listen listen to Radiohead's In Rainbows was via these on my iPhone on a very overcrowded overnight flight, and had me grinning ear to ear for the amazing level of detail - and silence - in the production.) All in all, can't fault them, and at £55 I might have to get the OH a pair!
EDIT: Just realised mine are the SE210's... That'll be why they were more expensive! They're great if you can get hold of them cheap (eg ...) though!
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