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Depends on the header and supporting mods and what you expect the powerband to look like. In some cases, a 4-2-1 would yield more low end power than a 4-1 header. Also depends on how it was made, who made the header.
As for the M2 - its seems to be a mixed bag. Hard to say the header is good or bad, if the supporting mods don't support the design or expected powerband. Many were put off by the price, a few were running in the several hundreds of dollars. Have to watch for knockoffs - some have bought M2 or other header manufacturers and found that they were cheap knockoffs. You get what you pay for in this area.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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