Highquality, I leave a little overhang when gluing, which is routed off once it has cured. This gives a nice clean edge. I've not had any issues with seams afterwards.
paisleyw, if you have a project in front of you, such as the bottom of the sump facing upwards... I use a laminate trimming bit that has a bearing at its base. The bearing traces the four outer walls of the sump, and I run the router counter-clockwise around the sump until all the overhanging acrylic has been trimmed away creating a flush edge on all four sides. The bottom of the sump is done. Next, I flip it over so the top is facing up, and do the same so the flange looks nice and clean.
