We were in loop 2600 in December. Overall, we had a positive experience and will go back. We paid about $239 a night and for on-site accomodations this large, it seemed like a very good deal.
Pros:
Very quiet. This was perhaps the biggest seller to me as we have three kids five and under. Our twins, who were 9 months old at the time, screamed a lot that first night and we didn't bother anyone. Also, no one bothered us. It's very peaceful.
The grounds are beautiful. Not the same as staying in a hotel by any means, but it's special in its own way. My husband and in-laws spent a relaxing day just hanging around and enjoying the beach (and hammock). The kids loved it.
My five-year old thought it was the best place ever.
It was nice to have a separate space from the kids at night so that my husband and I could relax. This is a huge plus. I would not, under any circumstances, stay in one room with all of us. I'd rather stay at the Motel 6 on I Drive.

I just need to unwind at night and you can't do that when the kids are sleeping.
Cheerful. There's just a nice vibe there, especially at Christmas when people decorate their cabins and RVs.
We thought the transportation system was just fine, particularly the boat to the MK. Yes, you'll wait. But that's to be expected. We didn't rent a golfcart, and we really didn't miss not having one, but we saw lots of people who did.
We also thought there was more than enough space and were pleasantly surprised to find that the bathroom was very large for a space this size. The beds were fine. I actually thought they were very comfortable; my husband, who likes a firmer mattress, wasn't too thrilled.
We found the CMs to be very friendly and helpful. There wasn't one person who didn't have a great attitude. Even the guy at the gate was cheerful.
The kitchen equipment was more than adequate.
There's a laundry room very close to loop 2600. It's immaculate. Nearby, you'll find the pool. My SIL said it was great. Not fancy, but warm enough to swim in in December (we're from NC, so we didn't find out as we are wimps and don't swim in the "winter.")
We must have had a renovated cabin, because all the furniture looked very nice. However . . .
Cons:
You'll probably need a car.
Very few dining options nearby. In fact, none at all that were within walking distance.
Our cabin was not very clean. Now, I have to add this caveat that I'm a lawyer and extremely detail oriented, so I notice things that maybe I shouldn't. It's an annoying habit. But, the shower curtain was filthy. We requested a new one. There's really no excuse for that. The fridge looked like it had spent a few years in a frat house. The inside was clean, but the outside was a mess. Also, there was something really wrong with the floors. My twins' feet and hands would come up black after just a few minutes of crawling on it. I'm not sure what the problem was and by the time I noticed it, we were unpacked and next to our relatives and didn't want to move cabins. Besides, we weren't in the cabin that much anyway.
I should note that my SIL's cabin was very clean and that they did not have any problems, so we might just have had a bad cabin. It happens.
If you're going to be driving and not familiar with the area, ask a CM at the check-in desk to show you the back way to grocery stores and restaurants that are off-property. There's a great shortcut, but I'm terrible at directions so I'll just leave it at that.
Good luck. Despite a few problems, I would absolutely stay there again.