No idea why companies don't offer it in their high end models, as it is a tool that compliments the floating bridge system perfectly and without retooling, makes living with a trem easier.
Decided to finally get one instead of just blocking the bridge with a piece of wood or similar. But it does so much more than that. Personally the things I like, and use, the most about it are:
Restringing and tuning. This may seem trivial, but the ability to block the trem fully in place, put new strings, tune them, and then unlock it, results in no need to use restringing and tuning tricks as is common with trems. Since restringing and tuning being so annoying with a trem is usually the downside, this solves it.
Block it anytime anywhere. Before I had to have a piece of wood or something to block it, and carry it. Sure, it's never a huge piece but this is integrated into the guitar and is a painless, safe, simple mechanism.
The only issue I've had is the fact that if your springs need a bracket to be held to the block, the clamp may be in the way. This is easily solved by getting longer screws for the bracket, or simply not using the bracket if your springs don't come off.
Anyway, a great addition. Now it'll be a must have in any guitar with a trem for me.