It is hard to pair, takes forever to "warm-up" for each reading, and when you do finally blow, the results change almost as frequently as you blow. In other words, it is not accurate.
They have basically repackaged one of those cheap Chinese breathalyzers for Keto. It is equally crappy, but much more expensive.
Having used urinalysis strips, blood test strips, cheap breathalyzers, and the Keyto, I can tell you that this thing is just an expensive way to sell you more (crappy) stuff.
This thing is a rip-off. Don't buy it.
Bottom Line: No, I would not recommend this to a friend
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