This is my review of the Wera Kraftform Kompakt 20 Screwdriver.
It is a nice looking screwdriver with the nice Wera Kraftform handle, and works as a short and full size screwdriver. It also comes with a nice pouch, with belt loop, for safe keeping. Another feature worthy of noting is the rapidaptor on the shaft, a very nice bit holder - rapidaptors stop the bit from falling out of the bit holder, or getting stuck in screws, and they do an amazing job of it.
The shaft of the screwdriver extends and can also be removed, to use as a bit holder for a drill. It can be extended by pushing down once on the green collar at the base of the shaft. It is spring loaded, so it pops right out. You can then hold the collar down, and pull it out the rest of the way to use with a drill. To put it back in, hold down the collar, and push it in. Simple. The adjustable length (to 2 positions) is a great feature for a screwdriver, and it's been very handy.
It comes with 6 bits stored inside the handle, which is also spring loaded and pops open when you push a green button on the base of the screwdriver. Inside, you should find PH1, PH2, PZ1, PZ2, SL1.0x5.5 and SL1.2x6.5.
So it's all good, or it was for about 6, 7 months, or around that. Remember what I said about the shaft? It's spring loaded... Well, one day, I was just minding my business with my screwdriver, when I pushed down on the collar and the entire insides - ball bearing, springs and the lot - flew across the room. It wasn't fixable. As it was a Wera product, I was sure it was just a one-off. I took it back to Screwfix, where I had paid £32 for it, and asked for a replacement. After about 10 minutes I got one, and was happy to have my favorite screwdriver back.
A month or two on, or perhaps a bit less - guess what? Yeah, the insides shot out again. I've decided that Wera have made a terrible screwdriver here - It's not the usual Wera quality, and certainly not worth £32, or the £30 it now costs on Amazon. Two of them have broken inside a year, due to the same manufacturing fault.
It's going to be tough to find a replacement that performs, or at least claims to perform, this number of functions in such a compact piece of kit.
I do not recommend purchasing this!
Aftermath:
.I did buy it at a tool show 
PB Swiss' Insider range includes a ratcheting screwdriver. Although I couldn't afford this particular ratcheting screwdriver, all my PB Swiss stuff has been better than Wera/Bahco. Made-in-Switzerland isn't cheap, but there's no doubting the quality's exceptional.