This grip is not very popular, and is not used by very many world class shooters. One exception is three-time IPSC world champion Eric Grauffel, so its not like the technique is entirely without merit. I say experiment with it, and if it works for you better than the fingers under technique go for it.
I think this technique might have some merit for sub-compacts like the Glock 27 because it would allow you more off-hand purchase on the gun, but I don't carry a sub-compact so I haven't tested this out on the range.
Good luck.
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