The dual trim super lite brush is an excellent weight and size. It is best suited to high level work on a SL-2 for maintenance cleans or for cleaning on sash windows with old glass or leaded windows. It could do with more bristles as it requires more scrubbing effort to remove baked on bird pooh than a Tucker brush although it does remove it but with a lot more effort.
I have cut a Tucker brush down to the perimeter of the bristles, then filed the back of the stock right down to the staples retaining the bristles...now it is almost as light as gardiners superlite brush but performs better and still gives me the confidence to clean with minimum effort knowing that I'll remove all baked on bird pooh.
Need to have confidence in a brush simply because I don't want to have to inspect windows after completing a job.
Still haven't got around to testing the single trim version out yet...will do soon but on ground floor windows.