I’ve had experience with a cheap detector (not those particular ones) and let me tell you they are a waste of money.
Since than I had 2 Valentines and now have 9500ix.
You’re better off without a detector than with a cheap one.
When you do get pulled over after you constantly get annoyed by fake alarms, you’re guaranteed a ticket with a detector visible in your window (my V1 and 9500 are hidden by the roof line and hard wired)