I shoot a nasty. It highly depends on the fields if you are allowed to use it however volume is sufficently to extremely less than an electro. I tend to get bursts of six out, which is 3 shots x 2 barrels.
They tend to like co2 better, but some get decent success with HPA also. To squeegie the left barrel, the right barrel bolt still needs pulling or a spin at least. The barrels also can 'cross contaminate' where the paint gets into the other when it breaks through the ball detente holes, sometimes.. So if you break the right barrel, the left might go later.
You can make it single barrel, but you have to adjust like crazy and it's just not the same, might as well use another PPS gun instead.
I dont suggest them as your only PPS gun, mostly do to the fields that disallow them, which highly varies.