We bought an EOYE Grand Chateau last year as our first timeshare, I can confirm it has worked out perfectly, you just pay half the maintenance fees each year and is easy enough to lock off and deposit and use one half one year and the other half the next.
I can also confirm what the others have said is true, it was a bit more expensive to get then an Annual week, we have had to account for the full cost of the interval membership fee each year for just one week, and we certainly got addonitis. Since we travel mainly in the off-season, we decided to pick up an annual week at Vacation Village at Williamsburg, so that gives us three weeks a year now for just a bit more than if we got an annual week (this is new so I'm not sure at this point if the trade power will be enough, but it seems like it will work for Orlando or travelling in the Fall).
One thing to consider is that the Studio and the 1 BR have different trading power, so if you want to use it for a specific purpose each year, it may not work, ie, if you wanted to go to Hawaii every year, the 1 BR may work one year and the Studio may not the next.
On the other hand if you were going to use it each year for something the Studio will pull and don't need the trading power of the 1 BR, you might be able to get away with an even lower cost trader like Vacation Village at Williamsburg or Colonies or other lower cost trader.
But if you just wanted another week a year to use for various vacations, ie Hawaii one year and Orlando the next, or whatever comes up then it is great.
Not including the Interval membership, I work out our GC week to be about $1,150 per week, the VVW is about $770 per week.
The other alternative that I am considering and see as a reasonable alternative to the lock off traders is to get a Phuket Beach Club week, maintenance fee thread has it as $1,150 and the only added cost is $164 for a trade, so just over $1,300, which is pretty reasonable if you are going to go for tougher trades on a regular basis, and it has a stellar MF/point ratio if you ever retro in the future.
(all the numbers are based on trading into 2 bedroom units, VVW and PBC don't have upgrade fees, but GC becomes cheaper if you trade into studios or 1 BR's)