Phototone,
frankly, I disagree - while the Universal finder might have a good price, its performance is so low that the price/performance ration is not good at all.
The inherent design fault of the Universal finder (and I assume, the Contax original as well, but I never tried one of those) - the 'guesstimate' parallax correction by simply turning the revolver barrel a few mm to one or two rather deliberately chosen distance marks (and even those 1 or 2 marks per focal length don't have click stops) - makes it totally unusable for any lens longer than 50 mm at portrait distances (say, 1 to 5 m); this is NOT cured by shimming, and what's the use of am admittedly nice and clear view through the finder, if what you see is not what you are taking a picture of? Even if you 'only' paid around 40 or 50 bucks for the revolver (which seems to be the average price), this is not cheap if you ruin a lot of pics because of this inaccuracy (and I'm speaking from experience here, and I own 3 of those darn things).
Roman