It takes a little bit of everything to keep running on all cylinders.

The system works very well, and yes changing out a cylinder is a lot faster than writing this post. 10 seconds with my hands full of other stuff (as usual).The basic locks are nothing more than builder quality - but they work fine and i wouldn't trade it for anything.Ed

I was told here and there that renting out a SFH that has keyed entry bedroom door knobs (standard single cylinder and turn-button on the other side) is a fire hazard and against some kind of code or, if not, makes you liable for fire hazard dangers. 

I've been doing trial and error with realtors, while looking at properties, but it sounds like its best to get all cylinders firing.

There’s no way I’d convert a duplex to a SFH . that would be like taking a v8 engine out of a truck and putting a little 4 cylinder in it !

No double cylinder. that is a fire hazard.

I can change the locks in a few seconds when the time comes, and I rotate the cylinders around to save money long term. 

Flash-forward 15 years- it's all paid off and running on all cylinders at 97% occupancy and market cap is 6.

@Sarah Dawson - I think if you took a poll from people they would stay it would take 2-5 years to ramp up to the point where you have a well-oiled machine of a business running on all cylinders. 

I don't believe Brian is operating on all cylinders and after all that I definitely want a full refund.