I'm reserving judgment until I get my hands on parts - which aren't yet publicly available. I've heard that their parts have passed rigorous materials testing, but until I get make some, machine them, and physically test, will I start to believe.

With $200M+ they better be doing something new! So far, we know they are very good fundraisers and marketers, but I do think it could be different this time (i.e. maybe they'll crack it).