Re: but that's the same as everyone elses review!
"there you go... could make it yourself for 70 quid for a single unit. reduce cost by at least half for bulk purchases and injection moulds."
Sure, if you don't value your time at all and don't want to make any profit. I'm not claiming RCL spent much time on this, but the cost of the actual physical stuff with most products is a usually a small percentage of the final price, its the time spent designing, testing and - in the case of houses - building that takes the lions share of the investment.