We have both generations of this sippy cup and I would rate them as the best ones that are available.  My daughter has used these since first making the bottle exchange and all has been well.  We did have one incident when the handles on both generations broke.  I contacted the company via email and was responded to within 24 hours.  They took my address and shipped new handles right to me.  They wished I had kept the pieces to send back for a failure investigation, but unfortunately those pieces were discarded.

 A first rate product from a first rate company.