Aerial 7T to Dynaudio C2

That is very true about preference for one brand's sound over another. 
There's no perfect speaker that suits everyones individual taste and their personal hearing acuity.  
Personally, I prefer a highly detailed sound that has a 3 dimensional soundstage with great imaging and lots of depth.  Also, dynamic range and the ability to convey a sense of weight and power in the bass is important.

I can't win. I just purchased a pair of JL Audio F110 V2s and a JL Audio CR-1. My system sounds better than ever and I say I'm done. Yesterday, a good friend offered me Dynaudio C4 Platinum's at a crazy price, but he wants me to trade my JL Audio subs and CR-1. Unfortunately, I don't have an opportunity to hear them, so I initially said no. Now, my disease(always thinking about the next upgrade) has me thinking about trading my Aerial 7Ts and subs for the C4s. I'm I crazy! 

Lady Fate has a crazy way of showing up when we least expect it. I would take this as a sign that you should go for the C4's. If they do not work out you will have satisfied your curiosity and can resume your auditioning process. 

Maybe you could try a 30 day swap?, with your friend.

My advice is to stay put - unless as Tom mentioned you can give them a try.  That is probably unlikely since moving speakers around is a hassle.  Your first sentence says it all.

I hate the way the C4's look and that is why I'm so hesitant.