I already bought 
JJ Cole Car Seat Cover on sale back in April through amazon but I also registered for this 
JJ Cole? Infant Urban BundleMe  they both look like the do the same thing which is go over the car seat to keep baby warm. Which do you prefer? I think I may return the the 1st one I bought...I like the look of the Urban BundleMe better.
                 
                
Re: JJ Cole Car Seat Cover & JJ Cole Urban Bundle Me?
They are different. The car seat cover is a shower-cap style cover that only goes over the top of the car seat. The BundleMe has a front and a back portion and can interfere with the car seat straps or prevent you from tightening the straps appropriately.
I would stick with the cover since it doesn't interfere with the safety of the car seat.
Keep the cover.
The bundle me voids the warranty on your seat and is not recommended.
This.
I have the toddler version of the Urban Bundle Me on our stroller and I love it, so maybe you could change your registry to that?
TTC since 11/05...ectopic pg 4/08...early m/c 6/09...BFP 10/5/09!

Nora B...June 15, 2010...8lbs, 8oz...Med-free birth!
TTC #2 since 7/11...cycle #3 of Clomid + IUI = BFP

Malcolm...September 21, 2012...8lbs, 6oz...Another med-free birth!
Which one interfere's w/ the carseat, the urban bundle me or the car seat cover? We registered and have this one but if it interfere's w/ the car seat I'm def returning-
https://www.buybuybaby.com/product.asp?BRN=1&sku=17442856&
Yep, that one does. I would return it and get the cover. I have the Cozy Cover, and I love it. I think I only paid $10-$15 for it.
It will most likely be in the owner's manual for your car seat.
The ones that go over the seat itself are fine, it's the kind that go under the baby that are not safe. They add bulk between the baby and the seat, meaning that during a crash, the Bundle Me will compress and the harness will not fit the child properly.
TTC since 11/05...ectopic pg 4/08...early m/c 6/09...BFP 10/5/09!

Nora B...June 15, 2010...8lbs, 8oz...Med-free birth!
TTC #2 since 7/11...cycle #3 of Clomid + IUI = BFP

Malcolm...September 21, 2012...8lbs, 6oz...Another med-free birth!
I believe that it states in most (if not all) car seat manuals that aftermarket products will void the warranty on the seat.
BundleMe's are not recommended because they compromise the safety of the child in the car seat as they add a layer between baby and seat.
Besides, most are made of just fleece and if you live in a cold climate, will not necessarily keep your LO warm as they offer no protection from the wind.
I hate to say it but I have had to argue with several police car seat clinics about whats safe and what is not. They only know as much as they choose to learn, and for many thats the bare minimum. Do some reading and investigating of your own before just taking their word for it.
The "bag" style car seat covers are not safe, there is a blog called The Kyle David Miller Foundation that has some very usefula nd sad info as well as a video showing WHY they are not safe. Also look into extended rear facing as well as extended use of a 5 point harness.