"Basically the same as the other review. I used it once on a breeze block and soft brick wall and the SDS arbor was completely twisted. It also wobbled suggesting something was bent and there is no flats on the core so can only use a spanner on the arbor. This means you have to hold/wedge the core bit to get the arbor off. Save your money and get a proper diamond core. It also took at least 10 mins to get through, my diamond bit would have been through in 2mins. You can't beat Marcrist as far as i'm concerned and they do cores longer than these."
"SDS arbour snapped when first used. Replaced arbour also snapped. Used an sds max arbour instead and the back conical threaded part of the core bit split. This tool does not stand up to the rigour of site use. I used it for two holes only. Although the description quotes "(compatible with hammer action drilling)" it clearly is not suitable for hammer action drilling"