I guess it is up to the individual. I’ve had mine for six months, I bought the first ones at my shop. I really like mine. Like anything new it takes some getting use to. Now that I have been using them for a while I get more power with less stress than my other fins. They work on long dives as well as dives in current.
I do agree that it represents more breaking points though, it’s fair point. I believe they are constructed well enough that with pre dive inspections you should be able to predict if something is wrong. The one thing I notice is more silting on fresh water and contained spaces like wrecks, so I bought a smaller fin with water distribution desing for those situations, which has solved that problem.
I would recomend the slingshot to any friend of diver, but you do have to get use to them.