My husband and I are fairly new to property investment and currently have three rental properties in addition to our full time jobs. We find that it's difficult to get out to show our properties when prospective tenants are available to see them. We arrange to have mass showing events on the weekends, but sometimes wonder about the use of a property management company to handle the tenant search, tenant issues, etc. 

Can you offer advice on property management companies - are they worth it or not? If they are in some cases, we are interested in recommendations or experiences.