It seems like everyone has given you good info on how to decide if an RO should/when be gotten. Now to the question should you build it?
I built my own for 2 reasons. first I love building things. Second, there was not any thing in the size I was looking for that for the price I was willing to pay.
Now if I had to make the choice again it would be a little tougher, Leader now has 2 small RO's and compared to what it cost me to build my own RO I think I would have gotten one of those.
You will have to weight out the options that are put in front of you and decide what direction you wish to go.