Going from Ocaml to F# is trivial, most of the time it is only a matter of adjusting the indentation and getting the correct name from the std. Going from F# to Ocaml tend to be harder since F# has a number of functionalities that are often used and do not exist in Ocaml (such as parallelism, sequences, active pattern, list comprehension, type providers, etc and a much bigger std). As a user of F# on linux, the experience is good (better than Ocaml on linux) and getting better every year (some library are still windows only but it is changing).