I know that this subject has been discussed, but I was wondering whether there was any consensus here on whether or not Macs need a Pure Sine Wave UPS? I need to replace a 3+ year-old APC unit of the stepped-wave variety which has been fine. When I purchased it I was unaware of the whole Pure Sine Wave - Stepped (approximated) Sine Wave issue. Does it really matter? I've heard yes it does / no it doesn't in just about equal measure. Sorry if this is stupidly redundant.