we have the 18 and 27, no point in getting any other lengths IMO as the 18 covers most domestic and is very light 27 for everything else, getting a super max next for the higher stuff.
problems though,
have had to re glue the claps several times now on 2 of them, and the plastic barrel in the clamp thread has gone, really should be metal clamps IMO
overall very please for the money, im sure teething problems will be ironed out by alex and I still think gardiners have the best poles on the market at good prices.