FWIW, my first "load" of ME flex track arrived yesterday. It's really nice: kind of reminds me of Atlas code 55, in that it has a "delicate" look to it.
For whatever reason, it seems flex track doesn't come with joiners. I had a bunch of Atlas N scale code 80 joiners lying about, and they fit perfectly.
Am looking forward to working with this stuff.
Mark in Oregon
PS: If anyone has any words of wisdom regarding using this product, please feel free...