The big plus for me is that the ad-hoc if/when/do are removed in favour of the standard operators, without the horrible then/else/end/and dance. Then you got a

The big plus for me is that the ad-hoc if/when/do are removed in favour of the standard operators, without the horrible then/else/end/and dance. Then you got all the life-improving goodies (in-{sequence,string,file,stream}, index-of-*, previous, etc...) that really add up to something.