Yes, the shape of a glass is important. But only as to general charateristics. You will notice that Riedel's shapes, other than the balloons closely mimic INAO tasting glasses - IOW, a tall-'chimneyed' tulip. That is all you need - a large (18 to 24 oz.) wide bottomed, tall-chimneyed tulip glass, availble @ $2-2.50 anywhere.
Riedel's reasoning behind their designs is one of two things. One, it is pseudo-scientific crappola with no basis in physiology.
Two, Riedel's 'science' is true, and you like the wine better because the glass is designed not to enhance the wine, but to dumb it down, by directing the wine away from those areas of the tongue best able to taste acidic components. See their description of their Burgundy glass.
Did you know you were using a 'special' glass?