Any improvements on a 275 vs a 270? I can buy a new 275 for $6700, and I know of a nice 270--not unused, but really good- for $4750. Plan on keeping whatever I get for a long time, re-sale not an issue, but if the 275 is greatly improved, it would matter. For instance, are the gearboxes better, is the breakaway better, do they do a better job, etc? Thanks in advance.