I love mine so far. Mine are very calm unless in shed. They aren't head shy and aren't flighty at all. This is what I've read of true SD Retics and learned talking to several people that owned true SDs. My male pretty much hangs out and watches anything that moves. The female moves more than him but nothing I would consider flighty. I made sure to get true SD though with both of my pair off of two different 5+' females and the same 4+' male. Not sure about some of the crosses and other claimed SD. True SD should be fairly even tempered.
Regards,
B