The biggest flaw with this tool is the attachment cutout or the design of the hole used to place attachments onto the sonicafter. The cutout on attachments are starshape with several small sharp branches. I found that this star quickly turns into a circle rendering the attachment useless when cutting into wood. This especialy happened on the endcut tools and scraper tools. Also when cutting or sanding certain materials the vibration loosens the bolt used to hold down the attachment tools. I believe this is happening as the star branches wear out the loose tool causes vibration. If you compare the cutouts on the attachments of the Rockwell to the Fein you'll see the branches on the Fein are rounded and longer making them more difficult to wear.
When the attachments are working this tool does a great job. It has saved me time and I have preformed tasks that I could not do on any other type of tool. Unfortunately I bought this tool to save money over the Fein but I will likely end spending more in poorly designed attachments
Get more detail about Rockwell RK5101K Sonicrafter Tool Kit, 37-Piece.
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