I have had a PC 340 for over ten years. I have used the 340 often and never felt I needed anything more for he limited amount of time I used a palm sander. Recently I began using the sander to sand Christmas ornaments. I found it perfect for the task, my R.O.S. was too aggressive. After getting bored with the frequency of changing between 150 and 220 grit paper I decided to buy a second sander. My initial plan was to buy another PC palm sander, currently the PC 380. As I researched online I noticed the overwhelming positive reviews of the PC 330. I decided to try it. I figured I could compare it to my 340 and If I did not feel it was worth the extra cost I could always take it back. I of course did not return the 330, I am considering buying a second one. The quality of the tool is obvious when you pick it up. Using the 330 Speed-Bloc in an enclosed garage is a substantially improved experience, if only for the comparably quiet operation. The weight of the sander aids in the ease of operation as well. I have found that less pressure is required to get an ornament properly sanded, less time as well. Other than the added cost, which appears well justified, I can find nothing to complain about, I have had no difficulty changing paper. I have just applied pressure with my fingers to the clamps, I have not used the provided tool yet. My only quandary  is justifying the purchase of a second 330 while my old 340 is still operational.