I do a reasonable amount of domestic rewires and refurbishments and I swear by them and use a wall chaser as much as i can
you need to buy a decent one though and decent blades!!!
i used to have the makita one(until my van got broken into)
now i have the metabo one
they are around the ÂŁ500 mark
WARNING! DO NOT even attempt to use one without a vacuum!!!
with a henry hoover on the end they are very clean
just make sure you use hoover bags with the henry to catch the dust or it will get clogged up
When you master them, the chases come out very neat and tidy and are a pleasure to make good afterwards
you will also need a sds chisel drill to knock out the chases and back boxes too
if your doing alot of chasing work its a must on the van as far as im concerned and will pay for itself in a short time