I've had an amazing experience with this seller. He is completely honest and goes beyond just transparency. He is incredibly thoughtful of what thw end product will be and is prepared to make adjustments as needed to deliver the highest quality Treatstock has to offer. My parts were not optimized for 3d printing. He printed them anyway and even made clever adjustments to print parameters to get the job done (such as modifying the parameter for wall thickness so that he could accommodate my .3mm walls on some pieces with his .4mm nozzle). The parts are great and functional. The seller even packaged all of the parts safely, neatly and beautifully.
Will definitely use this service again!