Inside Hargeisa it is horribly overpriced, that's for sure. It is too late to get in now and attempt to make serious money as an individual investor if that is what you are thinking. You will most likely get burned sxb. Your best bet now is to join a large investment group or cooperative that specialized in importing consumer goods or something.
Arabsiyo on the other hand would be a longterm investment, I don't see Hargeisa metropolitan area expanding that far westward with the population density required for serious developments (Paved Roads, Water, Electricity, Telecommunications) for another 15 years or so. That land will most likely sit empty for quite some time. Arabsiyo is a good investment simply because it is situated on the soon to be completed Berbera-Wajaale corridor. You can definitely expect some additional capital gains on your investment there if you are comfortable playing the long game.