You had the FO on your truck for a while, correct? Noticeable improvement over stockers? I've been looking through threads and have a set of lowers on my wish list, but that ~$140 price point of the FO fixed looks a lot more appealing than the ~$300 for Core or Clayton.
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Yep I did have a few thousand miles on them and they were nice. In terms of construction they're noticeable improvement over stockers. I didn't experience wheel hop with the stockers but I needed a replacement for them and the FO price fitted the bill.
We have another member who's running the FO's and he did measure the durometer on the FO and the stockers
@Tim Garceau he found the FO bushings had higher values which indicates a harder rubber and i'd guess a good thing for wheel hop. He had wheel hop issues with the stockers and i think the FO's helped him managed those. He should have a better long term review on the FOs than me as i went a different route with the Clayton ones. Last I heard the FO's were doing the job just fine in his truck and hopefully that have remained that way. can't beat $140 for a set lower or upper.
Claytons or Core are a lot beefier than the FO's. Their bushings can flex on both sides too so if you're into offroading the price you pay is for extra strenght and different style bushings. If you have a street truck there is nothing wrong with either choice, all are better than stock, you can also offroad with the FO's just like you can with the stockers. Clayton or Core bushings allow for more/easier articulation of your rear end with much less binding compared to stock so that changes the overall feeling on dirt roads for example, even more so if you're 3 wheeling on deep ruts etc. Pick your poison according to your needs.
Have fun.