Yes, I have bought it! Now that it is in the shops, actually examining one in detail brought me to only one course of action - I simply had to buy it. I will try and explain.
The first thing to report is that the toolkit is incredibly well made! Everything and I really do mean everything is of obvious high quality. Nothing is going to snap, break off or become damaged in normal use. The black housing tube is aluminium and everything fits inside perfectly - not a hint of that will do.
There are rubber coverings at both ends. The toolkit fits inside the main tube of your Brompton perfectly. The rubber insulates from vibration but the items inside the black aluminium do not rattle or make any sounds. When riding you would not detect it is even there.
The 15mm spanner remains in this position and acts as a handle to get the toolkit in and out of the bike frame. It's a clever idea. In this position you can use the toolkit straight away on the wheel nuts but if you prefer you can take it out and use the naked spanner.
Inside the kit there are some hex bolts and a cross head and flat head screwdriver. The opposite end to the 15mm spanner has a ratchet which is of course reversible for clockwise and anticlockwise. As with the rest of the toolkit, the switch is solid and reassuring.
The tyre leavers also have other functions at the top and are magnetised so that they fit together seamlessly when storing back inside the kit. Again clever engineering.
Last items are an emergency tube patch and small piece of sandpaper for preparing the area prior to applying the patch. You also get a small supply of additional patches.
The Brompton moniker appears frequently just to remind you what you have bought.
This little toolkit is brilliant and the design and engineering is bordering on perfection. I can see it winning lots of design/engineering awards.
I have to say that I was wrong. This toolkit is worth the £48 retail price. It exudes quality and like the Brompton bike it sits inside, performs a function that something similar cannot do. The midget spanner I bought is good, but comparing the two would be ridiculous. The toolkit is going to be more convenient to use, easier to carry and last longer.
My advice if you have any doubts is to try and see one in the flesh. I suspect the second you hold one, examine the quality of the materials, the fit and finish and see how easily it fits inside your bike you will like me change your mind. I have two Brompton bikes and I can see myself one day getting another toolkit.