I just use an easy sipper on my widemouth. Same idea different execution.

Definitely not anything against the product. If I've gone through three caps in fifteen years I'd call that a win. I'd consider the caps a wear product over time as it's the only moving part.

I've had the same nalgene for the past fifteen years. Used daily. Only thing I've ever replaced is the cap because I'll drop it and it'll hit a rock just right and cut the connector thing that holds it to the water bottle.