Screwfix wallchaser

Is the above item worth 20 + 7 for a spare bit? It's intended use is chasing in a new ring main and 2 x lighting switches in my (if it ever happens) kitchen.
By way of explanation behind such rash expenditure the walls are made of a peculiar white brick which shatters as soon as you look at it. Previously I have used an angle grinder (fantastically messy) and bolster (very boring) to cut the chases and wondered if Screwfix's magic toy was worth the cash.
TIA Richard
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Richard Savage wrote:

Don't know about the wallchaser, but if the white bricks you mention are the same as the ones we have(1), then SDS drill + sharp chisel bit was relatively painless.
(1) Quite fine textured, chip or shatter quite easily. Local builder refers to them as "Sevenoaks Whites", but I can find no mention of that name anywhere, so I reckon he made it up :)
Lee
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To reply use lee.blaver and ntlworld.com

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Lee Blaver wrote:

Hi Lee,
I tried the SDS+ on rotary stop with a chisel but found that the flat of the chisel tended to follow its own route through the brick. I think that rotary lock on my SDS+ is better described as 'rotary unlock'.
As for the name of the bricks, the description fits and I live in Sevenoaks!
Ta
Richard
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