I disagree . Cruise speed does not matter one bit, 100knots, 200knots, 300knots (don't know about 400, never piloted anything faster than 300). You're just sitting there. I don't see how an Acclaim gets close to piston Lancairs? In what sense? Cruise speed? Or being a death trap? It's no more a death trap than an Ovation or an Eagle. Nothing happens any faster where it matters, being take off or landing. All 3 use the same speeds. 75knots is not much faster than a Cessna 172 on final. Lancair IV is 95knots on final aircraft.
Maintenance costs will be pretty much identical and fuel flows can actually be a bit lower than Ovation for the same speed if you're willing to fly at or above 12,000. An Acclaim will happily do 180knots on 13gph at 12,000 vs 12gph in an Ovation (assuming the Ovation can actually hit that speed at 12,000 LOP). Go higher and it's actually more efficient. Maintenance costs will be fairly identical to an Ovation overall, maybe few dollars more per hour for turbo components overhaul, but if you run it LOP and cruise under 16gph, I don't see how you put any more wear on the cylinders than an Ovation.