I've used corner sanders in the past that just didn't make the grade. This one does. The extendable attachements work great. I just re-finished all of the exterior teak on my 41' trawler. This is an older boat that has a lot of brightwork. I wished I'd bought this at the beginning of the project. The attachments made sanding on the handrails, compartment louvers, air intake louvers, door jambs and just general detail work much easier.