about 7 years now I believe. It has been about 7.5 years since Flex was bought by Star Trac.Both the seated and the prone is the star trac impact line from star trac they are about 5 years old.
You are talking about the seated leg curl totally different piece. I do not like the Star Track seated leg curl. That has nothing to do with the prone or kneeling leg curl.On the seated They added a hydrolic adjustment instead of the pop pin that we had to replace more than once.
I've seen many versions of the Flex Fitness kneeling and prone leg curl but do not recall adjustable forearm pads. Certainly, adjustable anything is usually nicer.The prone the older flex version the forearm pads were adjustable they are not on the impact.
The kneeling leg curl I have is plate loaded I also have that listed in eBay.
I have not tried the plate loaded Flex Fitness kneeling leg curl, only the Flex Fitness selectorized. Everybody seems to have the selectorized models in the various golds gyms. If it was flex, I'm sure it was very good. If it was a star trac plate loaded kneeling leg curl, then I do not know.
I brought back to life a Tk star standing leg curl wich is by far one of the best leg curls ever made I will take a photo of it Tomorow
Now that sounds cool!! I am one of those that really likes standing leg curls and was planning to purchase the ATLANTIS standing leg curl. Would love to see pics of the TK Star.