Great build quality. Looks good too. Do you really need it? Probably not. Should you get it? Up to you. Does it make a difference in tone quality. I think so a little.
I got this for two of my guitars and no regrets. If you like quality components for your guitar like me you will probably enjoy this. Again, good crafstmanship and I know both guitars have been upgraded. One went on a Tokai strat and one on an EJ thinline strat. If you don't want to spend the money for such a small item, don't. But, I am enjoying both mine and have no regrets. Tuning stability on both my guitars is superb, however, keep in mind there are several other factors that play into that so it is hard to attribute it only to the claw. Also, if you are looking into minor upgrades to a tremelo like this consider pairing this upgrade with Raw Vintage Springs. The springs allow you to add 5 springs and have the tremelo function much like having 3 standard springs. The 5 springs vs 3 to my ears add a bit more presence which I like.
Lastly, can you leave your strat stock and have a wonderful sound and tuning stability? Yes. The key is in the setup, but, if you like many small improvements adding up to a better overall sound that only you may only be able to hear, check these things out. I can notice the small differences that modding my guitars makes, so, to me, it is worth it.