Nothing major, its just when working around them, its a bitch to get to the spark plugs, but the worst its that its impossible to put the wires such that they don't touch the #3 primary, so running sp boot protectors is pretty much mandatory. And those are a bitch to put on angled sp wire boots
Not only that, but if I ever take them out to replace them, it 'aint gonna an easy task. I'm probably gonna leave them alone this year, then just replace them when I do my H/C/I