I've built at least 15 PST kits and have three more on the workbench. I've found that the molding is generally clean and well detailed. I am building the same kit you mentioned and it is going together very well for me.
As others have mentioned, be careful of the soft plastic, and the thick attachments of parts to the sprue. Some cleanup is necessary, but for the most part the kits go to gether very well. I love building them, but then, after building ACE kits, PST is a breeze!
Good luck on your kit. I'll try to post some pics of my D1 Howitzer when I get over more of this flu. Right now, the flu is winning my fight to defeat it, so I'm not able to visit as much as I want.
I still have a third 'factory tour' to post! Maybe in a day or so when I feel better...