My yellow adaptors hardly ever break, in fact I have a bunch of them somewhere.
I got 2 batches and the first adaptor broke but the new one is ok. It stands out too much and doesn't glide like normal. I prefer the 4 blade myself, 6 blade is ok but didn't do the job for me. They do seem to stay sharper longer though, I am still using the samples and they work great after a bunch of shaves.
My Headblade is parked in its little spot in my cupboard untill I get some new yellow adaptors. My domestic worker dropped it while cleaning the batthroom and thats how it broke. I was so pissed off initially, but that propelled me into DE head shaving, so now I don't mind. I have not written off the HB though.
Once you buy into HB, it's tough to move to a different method. Fusion does a pretty good job but it's expensive.
Personally I'd hold out for the new blades & adaptor (which come out in August some time).