I've been using K550's for the past year and edm is all I listen to. Yeah,I agree they're a little thin sounding in the bass frequencies but the way they scale with a small amount of eq and processing is better than any other hp I've tried.
A few weeks ago I bought a pair of Denon D600's which are well known for being bass canons. I put about 30 hours on them and switched back to the K550 to compare. I use the DSP iir filter bass booster in foobar2000 set to 175hz and +3 bass frequency boost on the eq. The K550 had every bit as much bass quantity as I was able to get out of the d600, but it extends lower and and sounds so much better throughout the entire sound spectrum. Its a better headphone from top to bottom, so I returned the denons. Just saying... the k550s are capable of much better bass than this forum seems to give them credit for, but then again, a lot of people here have some kind of aversion to equalization as well.