Tony have you hit your head mate
Like I often say, my Supersport Custom with a .25 Lightning barrel is a joy to shoot, I was sending some big old lumps of leads done the garden the other weekend and the .25 AA pellets where grouping very well, although the "one hole group" was pretty large, you do have to remember that .25 pellets are pretty big in the first place, I'm pretty lucky with mine as it has the Superstar two stage trigger and the barrel pivot bolt, so no sloppy breech for me.
As Tony says they can be really nice to shoot if you manage to find a good one, I also have to admit that I also prefer it over my Mercs
Pete