I bought some RFY shocks for around $90USD two years ago.
The reason I went for these is that by all accounts they're a decent design and well built, the only issuers being quality control on assembly. So there are places like
ChrisLivengood
who re-build the shocks. I did a fair bit of research before buying them.
There have been reports of the mounts breaking, which is obviously a big deal. However that appears to be an issue with the cheap clevis mounts, and that could be an issue with using a one-size-fits-all approach which could result in crushing the clevis.. I haven't heard any issues with the eyelet mounts like we need to the KZ bikes.
I opted for 340mm shocks with the 8mm spring for my KZ750 LTD, knowing that would be about 50% stiffer than the stock ones which I would bottom-out on even with the preload set as high as possible. Perhaps the old ones had just worn more, because they feel even stiffer than that. Not harsh, but closer to a sports bike than a sports tourer which I was after.
Quality wise, I bought them with the intention of rebuilding for the quality control issues (they can have air in them which means the travel isn't smoot), but there were none, they were really good out of the box. They have been the single biggest improvement I've made to my bike, since they actually have damping unlike the old worn shocks, and don't just dip the back in and run the bike wide when going into a corner hard.
And after 2 years of mostly being outside, they still look great. The paint on the springs can go a bit dull if left for a while, but a clean and polish and it's back to normal. No signs of any corrosion or leaking.
So I'm happy with mine.