I've found that putting them in the dishwasher is a tossup. Once air (or heaven forbid, water) breaks the vacuum seal, they perform the same as a normal cup.

So long as you hand wash only they seem fine. But I don't have time for that so I stick to a normal bottle. Also they're bulky for the volume of liquid they hold.

I bought blanks for my first keyboard to force myself to learn how to touch type. I had some experience with it but there were still growing pains.