[drpellypo]

sorry for the delay in getting back to you chap; have been mad busy and don't get much of a chance to check on here.

You don't need to put much pressure, and indeed, if you're not getting correction then you need to step up your pad/polish combo. Did you use the cutting pad? If not, try that. Bare in mind a DA isn't going to always give you 100% correction vs a rotary which is a lot more of a powerful machine.

Re failures, a relatively small number have failed, nowhere near 50%. Megs will just replace it though - no questions asked. Part of the reason there is such a stock shortage at the mo.