I have a similar number actually.
They're hard to clean, especially the lid and threads where your lips end up.
They're strong but brittle, drop a full one on a hard surface and it is likely to shatter
They aren't insulated, meaning they sweat and the water gets warm.
I have broken more of those stupid little straps that hold the lid on then I care to admit.
These newer water bottles seem to have a lot of nice little features that nalgenes don't .
Still they are the most practical and straightforward water bottle, they are allergic to leaking and will last forever (given you dont drop full ones on rocks.)