I saw these at Summit: http://summitracing.com/parts/RUS-650040/

Any experience with them or something similar?

No but I have seriously thought about them.

can't realy see the need for quick release trans lines. mine are -6 braided so if i need to remove the trans i can lower it down for easy access to the fitting.

Have them on a few cars with no problems

Bill I thoght your car would have had these on it for sure! Ha Ha!!

Saw them I thought they might be good for carb fittings, although that leak doesn't sound good to me...

How many trannies do you blow up daily that these would be beneficial for cooler lines ?

Is there an advantage to running them,,or more for ease of removing ?

No advantage,just don't need and plugs for the lines or trans fitting,no mess.My thoughts is just something that can screw-up.

Been running quick release coupling on my tranny for about 2-3 years now & never had an issue with leaking or not re sealing.

Mine are Jiffy-tite quick connect fluid fittings, blurb states:
6061-T6 Aluminium body, anodized Black n Gold,stainless steel ball bearings,etc.

Expensive over here, they are about $80 a pair (Male & F/male)without hose, but was fortunate ti have a deal with the shop owner, based on previous purchases.
Like I said they dont leak & do come in handy, if money was tight, I would spend money elsewhere