Depends if you have the depth to work with. If you are 5,500-6k and can replace the top 3rd of the string with fiberglass, and can add enough weight to keep it in tension, then they are worth their weight in gold. A design as such can add 40-60” of downhole stroke. As long as you keep control of paraffin and use a hot oiler before you have rods stacking out. They will last forever. Space out the well and don’t leave enough polish rod above the clamp for anyone to ever drop the rods.
Low temp are good, high temp are better.
Endurance has the best for the money, they will design you a robust string.
Superrod is good but way too expensive.
They will also design you a robust string but their warranty isn’t what they claim.
Endurance on the other hand will cover the customer.