We purchased the Zone camping pass this past year (Sept 2013) as we knew we'd be doing alot of travelling through the States this winter. We paid $525 for 2 zones. They usually run 'specials' and you can get 2 zones for the price of 1. We picked the Midwest and the Southeast (which included Texas). There are only 3 'preserves' in Florida but we used our membership and visited all of them while in Florida this winter.
These preserves are not 'high end' but give you comfortable accommodations (pools, laundry, clubhouse, etc). What I have noticed, however, is that some of the preserves in the TT group are a little remote and not in high volume areas (ie not right off of interstate highways).
With our membership, we had 30 nights of camping included with the purchase and any night after that would be charged $3.00/night. We could stay at a campground for 14 days maximum and we would have to be 'out of the system' for 7 days. It worked for us.
By the end of March, we have used 36 nights of camping (since November 2013), so in essence we go our 'money's worth' of our membership of $525. However, we won't be renewing our membership this year. I don't want to be moving so frequently during the winter months (this year was an exception) and going in and out between 3 parks (and finding a park in-between) seems a little silly for us. (you aren't really ever 'settled').
But, if you are on the move alot and do want to travel, it could be very beneficial for you. Zone Camping may be the way to try it out (without putting a huge outlay of money out and purchasing a pre-owned TT membership).
Another option is to purchase a Ready Camp Go membership
http://readycampgo.com/ for as little as $99/year. The 30 night membership (for $99) will let you camp at ANY Encore resort in the United States for $20/night (plus $3.00 resort fee). So... by adding the cost of the membership into the cost, we can camp at Sunshine Key in the Florida Keys for $26/night ANY TIME ($20 per night + $3 resort fee + 1/90th of our membership) - we purchased the Gold membership which gives us 60 nights of camping at $20/night, 2 months advance reservation dates and 14 day limit at a resort (but you can go from one Encore Resort to another with no 'out time').
And yes, we have already used it in Mesa, Arizona and will be using it next winter in the Florida Keys.
The nice thing is that you don't have to be a Thousand Trails member to purchase this and therefore we will cancel our membership once it comes due because the preserves offered really aren't in the areas we will be visiting.
There are alot of great programs out there to save money on camping - our favourite is Passport America.
We are also Thousand Trail Elite members but need to mention that most TT preserves (they call them preserves not parks or campgrounds) there is a $3.00 a night charge for 50 amp service. There is no charge for 30 amp service. Thousand Trails does have a special now where you can purchase a single region for $599 for a year. This allows you to stay at any TT Preserve in that region for up to 14 days at a time and then you have to be out of the system for 7 days. Many public RV parks close to TT will offer a discount 1 week fee for the TT members during the 7 day out period. For more info visit
www.thousandtrails.com