I have a set and so far have been very impressed with the product. I have installed them for test fitment purposes only and found the adjustability amazing. I am in process of a full resto and wanted to try them before popping the body off. Installation was a breeze and again, the adjustability was very easy and simple. The product appears to be very well made and engineered. I can remeber literally spending about eight hours on my last TR6 swapping and shimming the rear mounts to get the car level and the camber set the way I wanted it. If you are lowering the suspension you will find these make the job almost too easy. Honestly, if I were leaving stock springs in the rear, I probably wouldn't have felt it necessary to change from stock since my car was already level.
Again, I haven't driven but a few miles on them to verify stability, etc., but I am impressed with the product. I hope this helps.
In addition, I'll go ahead and put a plug in for Good's bushing kits, sway bars and springs. After researching and talking to other folks who have used his parts I went ahead and purchased all of his suspension componenets. The swaybars are adjustable which if you have ever put larger front and rear bars on before, you will really appreciate. They are very easy to adjust and if you are concerned about understanding when or why to adjust, you'll know when the rear starts breaking loose on a corner. The adjustment allows you to dial it in to compliment the rest of your suspension set-up and allow for a more stable and safe roll limitation of the chassis. The bar mounts are a real piece of art as well. Most importantly, Richard Good has been very eager to communicate with me about his products. To me, that is a huge plus when questions arise during set-up or installation. He's just like us, loves the TR's but has the ambition and intelligence to make some very nice improvements to the cars we love.
Dave