The problem that I found, comparing to other mortgages is that the interest rate is higher. I worked out I needed €25k on deposit for the incremental interest saving (versus Rabo/NRock) to equal the additional interest cost (v NIB LTV), allowing for DIRT. For me, holding cash of €25k when I could be investing elsewhere at higher return (and risk) (even in light of recent volatility) did not make sense. If you have 100k, better to put it into range of growth options, not just interest avoidance.