Darren
You really have to make up your own mind. We did know that our purchase was built illegally when we bought. What we didnt know is how long it would take to be made legal. It still isn't legal today but we take the advice of our solicitor who is convinced that the authorities will make it legal one day.
Having said that, we had a few solicitors who wouldnt even deal with the company and refused to take our business! But we liked the house so much we still went ahead.
My thoughts on Royal dream are that it is probably going to be built after Trampolin Hills and their other resorts so you could be in for a very long wait. If you don't mind that, then its OK. In that waiting time though, a lot can happen e.g. company can go bust, change of local political party, intervention by central administration and decisions do get reversed. So you end up on a rollercoaster ride.
If I was doing it again, I would buy a house that is finished (built) but brand new so you can see what you are buying and have it to use straight away without years of waiting.
From an investment point of view, I do not think that 'off plans' are a way to make money and many new builds are being sold for their original purcahse price 2 -3 years down the line.
We have stayed on La Torre a few times and you can buy a newly built apartment for less than the off plan price paid 3 years ago.
In the local Spanish papers, it stated that all developments in Murcia have been put on hold for one year due to water supply problems. What if they never get a solution to the water supply problems? Places may never get built!
If you like the Macarena, have you considered buying a Macarena on El Trampolin (there are a few resales) which are still a reasonable price now (when the deeds are issued, I am sure the price will go up)
We do love our house so I am pleased with our decision but we both have more grey hair now!
I think it all depends why you are buying a house and in what century you would like to be able to use it! Nothing surprises me in Spain though and Sally has first hand evidence of what can happen when things go wrong. Do your research and use a good solicitor.