as far as advantage goes, yes there is regarding ets, u dont have to catch the bird, u dont have to take a rubber from its leg (all to the advantage of the bird) and fancier, but there is and always will be an advantage to fanciers using stall traps, u dont have to go into the loft, u dont have to catch the bird, and with ets when u are basketing u dont have to write out sheets etc, just get ure birds from the loft and put them in the basket and they are on their way, at the marking station its a lot easier, u call out the birds ring number and put its foot to the marker and if ok it comes up on the base station and the person on the base station tells u cock or hen, all very easy, after ur birds are all through u press a button to print and u and the secy gets a copy with all birds marked and pooled no writing or looking for ring numbers etc, taking off u just put ure clock in the base station and press print and the same again one for u and one for the secy with the times of arrival, and no variations etc its all done for u, also i believe there is an update now where ure velocities are worked out on the printout, all advantage, once u get ets u wonder why u never wanted one,