Yes, I've handled them a lot and shot one.
They are very nice, and in my opinion, easier to actuate. It's nice that you don't have to move your cheek from the stock when shooting. ASA also has great customer service. If you only get the side charger upper, it's a little expensive. If you add it to a complete rifle, it's only a $200 upgrade.
The handle is non-reciprocating and doesn't leave much open space for crud to get into either. There is less open space than on an AK with the safety off.
After all is said and done, this build will be close to the $2,000 mark, but I think I'll be very happy with the results.
Next up: a pure budget AR build. I saw a Spike's 16" lightweight flat top for $499.
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
Daniel Defense DDM4 V4 | Arsenal SGL 21 | ASA SBR | Savage Mark II FV-SR
Mossberg 590A1 20" SP | Mossberg 500 Cruiser