For The Love Of Port

I apologize if this has already been covered.
I own the traditional Riedel Port glasses but am considering buying glasses from Schott Zwiesel. Their glass and bowl are much bigger than Riedels. I often feel the Riedel glasses are too small and tapered.
Is there an ideal Port glass?

Here are two existing threads about this topic:

http://www.fortheloveofport.com/ftlopfo ... glass+idvp

and

http://www.fortheloveofport.com/ftlopfo ... glass+idvp

I have the IDVP Schott Zwiesel glasses and bowls are almost identical to Riedel. The Riedel are slightly fuller and have more of a cut lip. The IDVP's are a very slight rolled edge and the stem is square, not round.

I prefer tawny in IDVP's. I find the IDVP's to be more sturdy which is probably the biggest plus or difference between the two.

I just tripped over a source for the IVDP Glasses in Germany - so probably interresting for people from central Europe for those who have no other chance of getting their hands on them.

http://www.lusitaniagourmet.de/8.html

Price is roughly 30€ / 6 pack + pp.

I didn't ask or buy there, but if someone searches for the glases - might be a chance.

Greetings, Johannes