yes the basic is all you really need. easy to over-spend but i saw some recent work comparing top end with low end models and the differential in wind measurement was almost non-existent.
See how much you can and are willing to spend - and dance from there. For example, I like getting all the weather data: temperature, humidity, barometric pressure (hopefully including pressure and density altitude), wind speed (and its direction unless it's too painful). It's not <span style="font-style: italic">necessary</span> but it's convenient and it helps. Kestrel 4500 was the best tool I saw that delivered all that to me, and then something.
If you have to - the simplest wind meter should suffice. But if you can afford it - Kestrel is a pleasure to use, and it can feed you more data than you're likely to ever need.
To be honest all you need is a kestrel 3500..spend the rest of the money on range time....that what will make the difference. You can have all the bells and whistles and still shoot like crap.
I had a 3500NV and I upgraded to the 4500BT there is no difference in the accuracy of the wind measurement or any of the sensors. There are just more features and things that make measuraing them easer. The 4500BT is a bit thicker if I were tight on money I would buy the 3500 not even the NV version. Then once I have all the rest of what I want I would re-evaluate. It is very easy to get caught up with the equipment distractions.