I've had my boat a little over a year and my radar (when it actually worked) kept me from hitting fixed markers and helped me see barges in the dark/fog. The first time it helps you avoid hitting something, you'll be glad you got it.
My radar currently sucks. It is brand new and worked, briefly, when I installed it. However, it's been on the fritz for a a whole year. The problem with mine is not the radar antenna or chartplotter; it's the software interface and/or the wiring interface. The company fixing it under warranty even though the 1 yr warranty has expired. I won't even say what kind it is (rhymes with "owrance") because I'm not here to talk bad about them. Their customer service is very good; I've made alot of new friends because of my radar problem.
My suggestion is to get someone else to install it and get it working. You may be able to do it yourself (I think it is very easy, actually) but, when you're all done and it doesn't work, you don't want to be all alone crying to yourself (like me) about it. You want to be able to get someone to fix it. I've had to mail my radar antenna in for testing, I've had software emailed to me, and I've had several wiring harnesses mailed to me. Now, my chartplotter is with the manufacturer. They've had it almost 3 wks (which is a long time for them). This **** has gone on for a year. Man, I hate this S$#%.