Robert, the Costco glasses are 9.6" tall according to this post:
Like you guys, I use the Zwiesels daily (great QPR, strong, cheers vigorously without fear) and the Target brand of Riedels for burgundy style wines. Worry free operation for both of these. The Zwiesel Forte model has a small stem and crowds my hand slightly, but the glass is under 9" tall, so it’s not excessively tall. Zwiesel has a lot of models with longer stems though.
My local wine shop just started carrying Zaltos so I picked up two universals for special occasions. The glass seems too light almost. I tested them by drinking some water and it feels like the stem is bending with a heavy pour. Also, the liquid inside the glass seems to weigh more than the glass itself causing some imbalance in the hand. Anyway, let’s see how it goes when I drink actual wine from them. Perhaps the key is to use very small pours. Right now using the glass does not feel second nature.
Sometimes nitpicking things like a glass actually gets in the way of enjoying wine. Ideally you should not think about the glass at all.
Finally, I believe Saison in SF uses only the Gabriel Glas Gold edition. So consider those as an alternative to Zalto. A bit Less expensive and comes in only one shape, so don’t have to worry about matching the glass with the wine.