They have very mixed reviews, mostly bad. Personally, I think 32X is the minimum for rangefinding, the Bushnell or Burriss 8-32X can be used for HFT as well, but they are expensive. A Big Nikko, BSA 60 or Tasco Custom shop is more of an FT starter scope, from about £250 S/H. There have been good reports about a make called "Zos." Try a search on that one.
Gus