Thanks for your input, Cagey. Yeah, I wonder about the life span for the bit of spring steel, too. That knowledge is not within my area of expertise. I'd hate to have one explode during use. That could be painful. I'm hoping that they've thought that aspect through and tested them enough to expect them to last for quite a while. Hopefully.
One thing though, they can be fitted into basically any Strat-ish trem route, according to their website. So apparently they'll replace a modern trem, too.
As for a Wilkinson, I'm hoping to get something that will stay in tune after fairly heavy whammy use. I'd go for something like a Floyd, but the Bladerunners are being sold as somewhat able to keep up with the same amount of whammy abuse, yet sound better than a Floyd and not need all the lock down. It sounds almost too good to be true, but maybe it's not.