IMHO no they are not worth the money I have tried a couple of them and could never get the same speed twice matter of fact the ones I tried where not even in the general ball park.

I ended up getting a Chrony Chronograph from here.
http://elitetacticalsources.com/Chrony_Chronographs.htm

The one I got was the F1 for $59.95 plus about $8 for shipping. It was ordered online Sunday night and arrived here Thursday morning, they even included the 9v battery