Opinions on MSD Ignitions

I have a moderately modified 340 (about 375 hp) in a 69 Barracuda with a 4 speed and 3.55 gears. I currently have a 20 year old Mopar Performance electronic ignition setup in it. It runs OK, but am I leaving something on the table. I am thinking about buying an MSD setup: 8545 mechanical advance Pro Billet Distributor, 6200 6AL Ignition box, 8202 coil and 32749 plug wires. I like the idea of multiple sparks up to 2500 RPM. Buy I have heard a few negative comments about MSD systems. I assume they are just nay-sayers. Is there anybody out there who can give me some feedback on an entire MSD system?