I have to say I'm not a huge fan of the M1 filter. Its got a SUPER solid can, but other than that its not all that special. Its GOOD, but not worth the price, and that much can thickness is just overkill unless you're pushing oil pressures up around 200 psi. Bang for the buck, its hard to beat the PureOne.
PureOne has a shell "like a Pepsi can?" Bullsnot. My old big blocks run >100 PSI cold and 80 PSI hot, spiking higher on high-RPM bursts. NEVER had a failure, and I've squeezed the can while having someone start the engine- it doesn't deflect or bulge at all like a Fram orange can does. It may not be an iron pipe, but it doesn't HAVE to be. Its got plenty of design margin.