In collecting and evaluating data.  

I haven't seen much said about them but I'm satisfied with what I've experienced.. they've made me money and I collect rent every month.   

Also, focus on 2 years of job/income stability.Class D Properties:Cashflow vs Appreciation: Typically, all cashflow with little, maybe even negative, relative rent & value appreciationVacancy Est: 20%+ should be used to cover nonpayment, evictions & damages.Tenant Pool: majority will have FICO scores under 560 (almost 30% probability of default), little to no good tradelines, lots of collections & chargeoffs, recent evictions.

You are collecting payments on your wrap note and mortgage from the owner of the property and sending on some of the payment to the underlying lien holder (or better having your licensed servicer do this).

An 8% protected preferred return or a 10-12% target return. 3) Our passive note platform (Swell.investments) has yield from 8-20%. these are loans we have already originated and are available right now and we are happy to keep vs. matchmaking or crowdfunding where you only get to invest if the marketplace collects enough investor dollars or the matchmaker has a deal ready to fund (what you call whole trust deed investing).

It allows them to keep those afloat and can collect fees on that side by retaining ownership of the deal. 

Easy peasy. still haven't been able to collect on the judgment though 4 years later ;-)Personally, I wouldn't do a Sandwich Lease Option. 

Collect properties instead of money.

I lived for free for a couple years, while collecting rent checks. 

We are considering taking a 2-5 year risk of owning the home to collect on appreciation since prices are stagnant right now, and pray fire doesn’t take it.