thanks for chipping in Gaz
I currently use these https://www.modelsport.co.uk/product/arrowmax-power-tool-tip-cased-set-4-pcs;-1.5-2.0-2.5-3.0mm-367332 and a set costs the same as one Mip, so a bit unsure whether to go for it or not, I'd just replace them as I wear them out I think.