Hotchkis bolt on subframe connector

My experience with them - the bolt in ones are "ok" for mild performance street use and that's it. I had a set in a Scamp years ago, bought the 108" wb ones and added 3" to them - they worked but it was a very mild 318 car - even with the light duty ones- you will feel the difference, your daily driver will benefit from them. Make sure you use good hardware and over-sized washers where you can. Trailbeast has it right though, the only way to go if you are in need of true performance is weld in - and as 72blu says, making your own (assuming you have the skill set and tools needed) is THE way to go. In short though, which route you decide on depends a lot on how you will use the car and whether or not you have future plans of restoration...
Of course if you're getting a decent set - new and unused for a good price, what the heck...