They are spectacular. I actually like them a lot. They deliver massive devastation to the impact area but due to breaking up so quickly, do not over-penetrate.
They're easy enough to make. Use paraffin wax. Try a standard round of 7 shot and then try a wax slug made with the same against milk jugs or 5 gallon buckets full of water.
You'll have your answer.
Glock 19 G4 BFG | Glock 17 G4 FDE | S&W M&P 22 | S&W M&P 45 | S&W M&P Shield 9 | Ruger GP100 4" | Sig P226 MK25 | Sig P229 Extreme | Sig P320F | Sig P320C | HK USP 9 | HK USP 45 (Tan) | Walther PPQ 9
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Mossberg 590A1 20" SP | Mossberg 500 Cruiser