I bought this bottomless portafilter for use with. Breville touch. It works as intended, locks in place well, and the basket seats nicely. The only reason for not giving 5 stars is the wood handle likes to unscrew, something I can probably fix with a bit of loctite, and the overall build of the portafilter is pretty light. I’d estimate it’s about half the weight of the breville portafilter. I feel like if I crank it hard enough I could snap the handle off.
Time will tell on durability, but overall it’s a well performing Porta and gets the job done (at a price that’s hard to beat).