I am really not experiencing problems, at least with Voxel sculpting, which is the use I make of 3D coat.
I also generate STLs for 3D printing of my models, to distribute them to miniature collectors. Regarding that, I love as well how optimal 3dCoat is when reducing models weight but keeping all the details. For my job it is very important that models weight as less Mb as possible but still keep all the sculpted detail once the model is 3d printed, and it really does this job wonderfully. All my customers are really happy with how our STLs look when printed (weighing only 18Mb per model's STL once optimized by 3dCoat!).