I have 5 of those traps, and 5 of the kilgerm ones, the kilgerm are better, although dearer, you get what you pay for, kilgerms ones are bigger all round, the smaller ones have started rusting already, kilgerm not, kilgerm will catch any size rabbit, the others I think a large rabbit would have trouble getting into, although they make ideal squirrel traps
as for using them, I did a rabbit job on a stretch of railway line that was suffering from rabbit eroussion/digging, used 50 kilgerm traps in a line, spaced 10ft apart and baited with grated carrot, got good results of between 10 to 15 ra