Theyre worth keeping an eye on.They will be at IBS, delivery times is a great question to ask them.  

It is worth paying more upfront if it takes less time on site to put together.

Is it worth waiting the 2-5 years? 

If you think/know that the proeprty is going to appreciate like crazy over the next few years, then it's worth keeping.....

@Annwar MataniA few comments that I don't think have been mentioned among all of the replies that are worth considering:1.

Is spending thousands on a sprinkler system worth it or do I have other options? 

The only inssue is that i have not found many people in the area that have done it and would like to ask if any one here has done ADU's in Orange County or Long Beach and has it been worth it for you . 

Remember: cheaper doesn't mean you'll make more money.Start by going to www.narpm.org to search their directory of managers.

Now, this tenant is saying that they don't remember any agreement and thought they paid month to month and could leave whenever.

It's worth checking out.