The key is to find a reputable one. 

If you could afford a $400k property in Boston... would you stick to a studio apartment in a good area of Boston or go to some of the cheaper areas where there are longer commutes and more of a reputation for crime?

A reputable company sells you the home fully renovated and provides professional property management.

These are usually small lenders.Suggest you find another lender LOCAL to you with a good reputation from other borrowers in your area.  

On the tenant background information however, you should at least be provided with the lease and the names of your tenants however, we nor most reputable PM's will share sensitive tenant background or contact information with owners.

They can have a bad reputation with some people, but I think they are a great option if the deal is right.There are lots of options for parks across the Denver area.

Does anyone have any tips on how to select a high quality, reputable wholesaler in Oregon?

Since you want to work with investors, find a broker that is highly reputable in the investor space.

Justin has a great reputation and also adds drone shots if you desire. http://insightphotoandvideo.co...

It doesn't matter if you're with a big or small company, investor focused or retail brokerage...your broker's reputation is on the line if you mess up, and if you've asked a question with no answer the disservice is to you AND the broker.