Meaning you should not have to "perform" on the contract in anyway that will leave you owning a large debt.

The trick you have is to be able to identify which ones can perform. 

I've listened to the podcast and read a couple articles, however I would definitely allow a more experienced Investor perform a sub2. 

From the research that I have seen done and with the clients I work with non performing and performing notes are a solid bet. 

I am a mortgage note investor and end up with a fair number of non-performing notes. 

An under performing multi will take better managers in there than what was there, the property may have a tainted reputation, there can be deferred maintenance, if it's empty there is a lease up period where a new buyer needs more capital, and on and on and on......that bank doesn't want to see that property again if they really don't have to, really have to.But, if they are hung with a property, if they can find a strong borrower, that has experience they may give it another try, but they will be explaining that one in the next examination.When the say they want it off the books, they mean they want the liability off the books, they want REO assets off their books because they can't be in the ownership of real estate business and they want cash deposited instead of wasting RE.

On the surface, the property is performing well.

I'm not that smart and I've purchased over 3,000 units the past three years on behalf of the fund I work for and every single one of my deals has been a strong performer.  

Any service is only as good as the people performing the work.

They are likely to continue to trust you if you continue to perform.