He needs  good RE broker to give him price its worth ..

That's not worth 15% of the job.Another thing to consider is that some managers will charge low management fees and then add maintenance fees to bring in more income, while others charge high, all-inclusive management fees.

Is it worth it?

If it costs you thousands to refinance it needs to be worth it. 

I think the SMS automatons alone for GHL are worth the price of admission.

I am going to check it out.

My approach is to take a few minutes per quarter and make sure it is accurate by manually checking my true competition and adjustmenting prices accordingly. 

What is your time worth to you?

Just make sure you use a very honest agent that doesn't sugar coat anything and check the crime statistics and household income.

Are there any house at that price point that would rent for $1200-1500/ month with 20k worth of updating?"