First glance was that the lid and flip cap were made of heavy duty thick plastic, and there was no gaskets to lose. Still gunshy, from multiple mishaps of whey splatters on the kitchen cabinets, hardwood floor, or myself, I held it over the sink I gave it a whirl. The result: No leaks, everything was mixed, no chunks. Perfect! But how long would it last? Well it has been apprx 8 months with constant use, and it still performs like the day it arrived on my doorstep. I have since bought another one and have them both in constant rotation. The stainless steel blender ball works like a champ, no chunks, although it does sound like you are shaking a spray paint can when you are shaking it, but a small price to pay in my book.