I own a c300 and I love it! I've had my drive for a while now and my reads are still at 330 or so, my pc boots up incredibly fast and just feels a lot snappier than it used to. I dont think the extra money would be worth it for the M4 seeing as how you wont be able to tell the difference unless you benchmark your drives.
Edit: Just checked and seems the M4 is cheaper than the C300 currently, possibly a sale? I change my vote for the M4 since it's about 5 or 6 dollars cheaper
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