This actually looks like an array/vector structure (supporting, among other things, fast access to the nth element), so a comparison with CCVector, CCFun_vec, BatVect, Clarity.Vector etc. would be more appropriate. The name is a bit unfortunate considering the naming used in the general ecosystem.
Some time ago, I added some crude benchmarks to containers’ benchsuite. I’ll see if I can add Sek when I find time.