I just upgraded from the 250. It is worth it. But, since I spent the money i need to say that. Seriously, don't even question it. No more baggies over the electronics when it is raining, drizzeling, wave spraying, etc. You can also set it on the dew soaked ground and wet beaches. Then you get to the difference in discrimination, the pluses of the higher frequency, the better sound, water proof in case you md drunk after quac and beer on a Mexico beach and fall over, etc. And, the choice is obvious. Now, add in the fact that buying a new detector will recharge your md excitement.