-lrb- this be a update to the review I post below . after several month of use , I be have a problem with the waste port ... the path that clear the dust from the surface to the bag . basically , it be get clogged and while this do not prevent the sander from work , it do prevent dust collection . clean the port be a pain , I have to disassemble the motor cover and use a very small screwdriver to push the clog out . -rrb-  i really like this sander , but I can not comment on long term durability as I have only use it for about a month . nonetheless , Bosch 's reputation for build high quality power tool be pretty solid .  the belt alignment on this be pretty much maintenance free , I have not have to adjust it yet . the overall design be outstanding , easy to use with one hand when you need to , and have good grip for when you need to bear down .  the other aspect of the design that be top be that you can easily get into tight spot . the motor housing do not extend past the right side of the sander . the variable speed switch be nice , and it have a wheel to modulate the top speed -lrb- a higher speed would be nice , I think this be 1,400 feet\/sec -rrb- .  the sander really be `` almost dust free '' , just depend on what you be sand . the dust bag be the only negative , it be small and need to be empty a lot . but after look at it , it probably would not be a big deal to retrofit another bag .  Bosch 's 4x24 sander be also really nice , but it weigh 14 lb . the 3x21 sander be perfect for most job .