We bought our 29.3 (2016 model) In April and after getting the initial bugs out through the warranty have had zero problems since. If you are worried about gas mileage, maybe you would be better off with a Class B... although they are more expensive. The diesel models get better mileage but cost a lot more, and you could likely buy gas the rest of your life to make up the difference between the Ace and a diesel costing $70,000(or much more) than the Ace. You likely will get around 8 mpg in your Ace, maybe a 1/2 to 1 gallon less per mile if you tow a car. The Ford V8 does a good job but is noisy unless you know how to drive it. For example, don't use the cruise control in areas where you will be doing hill climbing as it will shift down at least two gears ard run around 4,000 rpm when it isn't really necessary. Without the cruise control you have some control over the gear selection and with a little practice we usually only downshift one gear instead of two and it is a lot quieter.
Proper tire pressure is a must, also wheel alignment. If you have it right we don't feel you need any extras to drive down the interstate at 60-65 mph. It seems to track right and even in the wind I have not had any big issues. Others have added Safe-T-Plus but so far I have not needed it.
We too like the floor plan, but looking back we wish it was three feet longer. Also, the drivers seat does not move up and down...a poor decision by Thor.
We also wish the black water holding tank was at least 10 gallons larger as it seems to filll in about three days and there are only two of us.
All in all we are happy with our Ace, and likely could not have got anything else new at the price point we paid.