I have been using AWS for 16+ seasons now. Wouldn't want to go back. Extra maintenance??? Yeah, I guess if a few extra grease fittings is more maintenance, then I guess so. Mine has and still does work flawlessly. The reliability and maintenance "disavantage" can't be substantiated by my experiences. And my turning radius is 13". Considerably better than 24". This is very valuable when you have alot to trim around. Now, if the mowing is mostly open spaces with only a few things to mow around, then it's of little benefit to mowing. But, then consider snow plowing. I can plow sideways easily on a 10' wide driveway. I can steer with the front end off the ground or lightened by the plow. And drive force is always in the direction of travel. No push-skidding the front end around curves. Turning on hills can't be beat on an AWS. They aren't for everybody. But, they do have some pretty good advantages under certain conditions.
The mower deck delemma is a strange one with JD. I can see how that might be a show stopper. But, if you can get 10 -15 years out of the 62C, isn't that pretty good. I thought I also read that it was pretty easy to mount a mower deck from the older 400 series deeres under the 700s and that these decks were on-par with the 7-iron. Don't know if this is true, nor to what degree it would reallly work, or allow AWS. Just thought I'd mention it. Those decks in excellent to new condition are pretty common place. I know my 54" deck under my 425 is still in outstanding condition after all these years. And I'm pretty hard on it too. I do very little to maintain it, simply clean the grass off of it in the fall and keep it greased. I haven't even had to change the original belt (970 hours now).