That look awesome! Does anyone know how good an alternative it would be to clearcoat? What the benefits of clearcoat be over this product?

If you had a machine that had a little bit of PF damage or imperfection - but not worthy of a the cost of a clearcoat or refurbishment - then I would seriously consider getting one of these for it.  You are not going to continue to damage the PF - and you get a very good medium term solution to protecting the PF.

Looks good . Just one question Do you think any muck and dirt could get under this with lots of plays?

I am sure there will be over time (Pinball dust gets everywhere) - however having the easy option of just lifting the protector and cleaning if it gets thats bad - is all you would have to do.  Its not stuck down - can be replaced - low cost - it feels very very durable.  It is not soft by any means.  I would rather this - then mylar or other stuck down options.