quantumeffect
... it looks like mikedocy is using them and it sounds like the current models are just as good as the originals.

I use the less expensive model (extremeheadphones) and like it. The headphones don't sound as good as a good pair of studio headphones but the sound is good enough and the isolation and ease of use is what matters to me. The more expensive model is supposed to sound better.
 
About the headphone vs. in-ear debate: I like the convenience of the over-ear headphones. Easier to put on and take off. More robust. 
 

I actually use industrial style foam earplugs, and then put my headphones on. I hear my drums and the click just fine, and my ears don't ring afterwards.

bit, they only reason I went off topic is to explain that noise cancellation headphones are not made for studio monitoring but for constant noise reduction.
 
"BTW, I did an experiment once using the Shure IEMs with OSHA-approved ear protectors over them. The kind you see the ground crew wearing at the airport. They're too clumsy to wear while playing drums, but wow, talk about isolation!"
 
bit, do what Alex Van Halen does and duct tape them to your head!  JK.  I use this method (without the duct tape!) to listen to music while using my leaf blower. While it does work, they hurt after a while. 
 
I did try the Vic Firth headphones and they weren't too bad, but I gave them to a vocalist and in an attempt to get total isolation she pushed on them hard.  These were the old ones with liquid filled earpieces and they leaked goo all over her! 
 
So for now I am using cheap Sennheiser 202s (~$20.00 on Amazon).  They work OK for isolation, stay on pretty good and allow one ear piece to be moved off the ear if necessary (since they are DJ cans).

Ok, quick update for anyone interested.  
 
The Vic Firth's are crap.  Ok, they do the job well, really well....for a time.  Then they break, and apparently very easily.  The guy at Guitar Center told me that they have a steady flow of them coming back to the store getting replaced and repaired.  He told me do *not* buy them without the extended warranty because you will use it.  More than once. More than twice.  Funny enough, he also seemed to think Vic was the only one making isolation headphones.  He knows better now.
 
So..I got the Kat Percussion KTUI26 isolation cans for 70 bucks.  So far, really nice.  They block the incoming sound just like my shooting ear protectors and they are very comfortable, and the sound is really good.  I'm impressed with the build.  They feel like they are going to last.  The reviews are way better than the Vic Firths, a lot more consistent and apparently far more reliable.  I'll have to use them for a bit to see if they last.    
 
I have a feeling the Direct Sound EX iso's are good too.  Haven't read much bad about them, just more expensive.  
 
 

Thanks for the tip, VLV. From the user ratings on Amazon, it does appear you've made a smart choice. Several mention using them while operating a lawnmower or leaf blower. Now that's an isolation test!
 
How are they for just kicking back and listening to music? I wonder if they might be an alternative to IEMs for air travel.

I think they're great for just listening.  I mean, I don't have an audio engineer's ear like you but they have surprisingly nice low end and the rest of the range sounded like my 30 dollar wal-mart Sony headphones - but nice and quiet.
 
Thing to remember is the cans are a couple times fatter to accommodate the isolation magic so your sartorial coolness may drop a couple points if you wear these in public. 
 
They are designed to squeeze on yer head, by the way, so I'm not sure if that would irritate you after a while or not.  It didn't for me.  

My sartorial coolness never survives a 10-hour flight. By the time I stumble off the plane at my destination, I look (and probably smell) like a refugee from the homeless shelter.