Feature:
The thing for me that is most helpful is the space setting. I don't have them setup in a huge control like some who own them might. They are in a dorm room so I keep it on the "Quarter" setting. It really helps because with it being a small room and having a roommate I can still listen accurately and not bother the rest of the building. haha (which these are easily capable of)

Quality:
These speakers are made extremely well... I often get nervous of knocking one of the 4 mid-woofers though, but as long as you're careful it's not a issue. It's nice the tweeter has a guard on it though. I feel like if you take care of these speakers they could last you many many years. These would be appropriate for on the road too. If you read in the manual they are made to withstand very harsh conditions of heat, cold or humidity among other things. I don't have any experience with taking them on the road thus far though.

Value:
I think the price may be a bit high on most sites...It's a good speaker though and definitely worth what you pay. Compared to other high end monitors.

Desirability:
I think as far as how they look... They are the coolest speaker out there..... The design being so unique and clever...how could you NOT have to have these?

Sound:
The sound is even and clear. It brings out things I could have never heard from my old ones. The bass is very accurate...it really fills the room when it's supposed to.

Ease of Use:
I had a slight problem with setting the volume of each speaker, since they have their own control. With my room being so small these speakers when set at "0" on the back are waaaay too loud. I finally have found a happy medium around -13, but the best part is the quality of the sound is not compromised at all when turning the volumes down. Good job on that M-Audio!

Support:
Haven't had any problems yet.

Overall:
These are perfect for amateur or professional. If you can afford them, you won't be disappointed! Trust me.

Feature:
They included what I needed. The acoustic space switch is the most useful feature for me.

Quality:
The build is just breathtaking. They are built very solid and flawless.

Value:
Worth every penny. They cost double what my other monitors cost but the sound difference is something I can really hear. So in my book they are a bargain.

Desirability:
Technical marvel for the ears and eyes.

Sound:
Fantastic distortion free sound. I have been using the M-audio BX8a monitors for a few years. They sound good but are a little rough on my ears. The EX-66 monitors are easy listing. The sound is so smooth and clean. I can clearly hear everything in the mix. Fantastic set of studio monitors.

Ease of Use:
Easy as can be. Great set of instructions included also.

Support:
Well I haven't needed it yet for the EX-66. I have called M-Audio in the past and they were very friendly and helpful.

Overall:
Since these are a major upgrade. These monitors should meet my needs fine for the next five years.