I own the twin sister of the aircraft you are looking at- G-AVXC!
The type is great fun to fly, generally very easy, and has very few vices; although there are a few things that need to be briefed before you fly it. Such as awareness that this is a low momentum type. Lose the engine and you are coming down steeply if not fast. Glide ratio is about 3.4 to 1.The controls are very powerful and work effectively right down to the stall (about 30-35knots indicated), the stick forces are light and a gentle touch is needed for normal flying. There are also the usual precautions to be taken with the VW engine, they are very prone to carb ice. I would add at this point that the most important check to carry out downwind would be 'carb heat',do you agree DB6?
As you are considering a group owned aircraft you are likely to have advice available with regard to general operations and maintenance, there are a few hints and tips that are best learnt from others than at your own cost. An example is the need to lift the tail of the aircraft once it is put away in the hangar, this takes the stresses and strains off the u/c bungees. If left 'stretched' they will perish and fail prematurely. There are many other bits and bobs I have picked up over the past three years, mail me for more info.
There is a book available which is very useful about the history of each and every Nipper built. It was written by a Belgian guy called Raymond Cuypers, he also has a website. Just type 'Tipsy Nipper' or 'Raymond Cuypers' into any search engine and you will inevitably find it.
Good luck with it all.
CRX.
Ps: How tall are you? Measure it up before you commit
DB6- After re-reading your post could it be that G-AVXD is fuel injected and therefore does not have carbheat?