I have a BASIC F1 Chrony. Shoot and it tells you the velocity. Shoot again to get the next reading. it doesn't average, string, calculate anything. ( A $2 calculator does that.) It's a good basic no frills machine that has provided allot of data for my "hacking around"/ load development. I paid a whopping $35 for a remanufactured one right of the chrony website. I believe you can still get them there or on Ebay for under $40.
If I was going to use it allot more than my 2-3 times a year, I'd probably opt for a more advanced model but I have no gripes with this one after 6 or so years of use.