I have a makita wall chaser , this is an excellent piece of kit. It does however say that it should not be used without a dust extractor as the fine dust will bugger up the machine . I use a Bosch GAS50 vacuum.. superb kit for this machine and leaves no dust to talk about . I have even done chases in domestic homes with carpets laid and no mess. ( dustsheets are obviously used also ).. Not cheap tho total kit inc vac was around £700, but I use it regularly . I can cut a 20 x 25mm chase across a floor in 10 mins included breaking out the centre.. saves me a fortune in time.