I'd say go for it.... but get some more "white knuckle" time in on the LT-40 before flying the cub. As always, have someone more experienced at the field look it over(and test fly it if you have any doubts or even slightly nervous)

Cubs aren't all that hard to fly, but they do have some quirks... before you get it, read everything you can about cubs in general, and especially this one. (search, search, search).