Let me start by saying these funnels are a lifesaver when it comes to messy oil changes. The flexibility is their biggest strength - I can twist and bend them to fit into the tightest spaces under my car's engine. No more awkwardly holding a rigid funnel at a weird angle!

However, I do agree with some reviewers about the thin material. While they hold their shape decently during use, they feel flimsy in hand. I'm always worried I might tear them, though surprisingly they've held up through multiple oil changes so far.

The temperature resistance is impressive. I've used them in both freezing winter mornings and hot summer afternoons without any issues. They didn't become brittle in cold or melt in heat like some cheap plastic funnels would.

My biggest gripe? They're too easy to throw away accidentally! The thin profile makes them blend in with trash, and I've nearly tossed them out several times after oil changes. Now I make a point to immediately hang them up after use.

For the price, having three means I can keep one in each vehicle and my garage. They're not perfect, but they solve specific problems that rigid funnels can't handle - especially for awkward fill points on lawn equipment.