The quotes were only a few hundred dollars extra annually.

I've tried the lower 6-7% PMs and usually you'll either pay mark ups on repairs (what you've noted) or pay extra fees (i.e. labor hours, extra calls) that you may or may not notice. 

Living in one unit and renting out the others could offset a significant portion of your mortgage, giving you extra breathing room as the sole income earner.

I would have to get with the property manager and mimic the exact plans they have set up in the lease, all of which were probably customized by the PM to get a few extra dollars.  

This designation doesn’t cost extra or give the manager access to insurance payouts but ensures you and the property manager are aligned during incidents, such as tenant lawsuits or insurance claims.

If so, are your amenities worth the extra price?

It may sound nice to pay a 6% management fee but the extra fees can add up to be more than the other company that charges 10% with no additional fees.

You are not paying for their services and won't cost you anything extra anyways. 

If your average heating bill is $150, you may not collect enough in the winter months when the bill reaches $225 but you'll collect extra in the summer when it drops to $65.

After adding an extra bedroom and bathroom and rehabbing the house, I was well over budget.