That is an understandable sentiment - they are fantastic in their stock form, and I was feeling unsure about going ahead with the mods as well considering that I only have the one pair. But the hole exposure mod does indeed transform them into different beasts. As Lors has said, it's like transforming them from bookshelf speakers into full floor speakers. And as Pataburd said "With the headband tubes closed off, you lose a lot of spatial sense--soundstage shrinks and gets less 3-D, the mids become shallow and the treble gets fatiguing.". It's hard to believe those words when you've only listened to them in their (awesome) stock form, but it's true.
If you only have a stock pair, then it might not be worth the time and risk of modding them. But if you have a couple of pairs, it's worth trying, especially knowing that you can get a modded pair back to stock again if you want to.
Edit: strikeout above due to my having used Pataburd's comment in the wrong context. Explanation in following posts.
Edited by waynes world - 3/7/14 at 8:12pm