SofaKing
Buying a chrono is one of the best things you can do to improve your shooting. Great decision.
Before I get to a specific recommendation, let me say that consumer electronics, which all of them are, is generally crap, sometimes with phenolic PC boards and who knows what else. The circuit designs can be poor with poor margins, etc. Some are better than others and once in a while you will find quality commercial electronics. With that caveat I would advise you to spend an extra $50 and get the CED M2. They run around $200. The CED is commercial electronics but it is pretty decent. Nevertheless, after many years of regular use the cables broke. I replaced mine with some very similar audio headphone cables form Radio Shack which have held up much better. This involves taking the heads apart and a little soldering which is easy to do.
The Magnetospeed will change point of impact which is a deal breaker for me plus I don't like having to move it from rifle to rifle if I take more than one to the range which I usually do.
When you get your chrono, keep in mind that for any optical chrono you need to align in pitch and yaw or it will read low. I use a bore sight laser to align mine. The Magnetospeed has an advantage here in that installing it aligns it. A very nice feature.