Just saying, to label something as not a useful firearm when you've never fired it is presumptuous. Understand it may not seem interesting to you, but that's hardly a yardstick for the market or any market.
Obviously the P90 is a more robust platform with a longer barrel and built in stock, but again, it is also 3 times the price. Is it 3 times better to the person who is shopping for a 5.7mm carbine/oversized pistol?
I can see a perfect fit for this no where near niche (if it performs) as a bedside home defense weapon. It's compact so easy to store without needing a huge safe in the room. While larger than a pistol it also outstrips the capacity so you don't have to fumble for extra mags in an emergency. I'm sure some tacti-cool folk go to bed with mag pouches, NVG, and four firearms to grab. I don't, when I get out of bed in my shorts I want to grab one item. I live in a 1200sq ft house built in 1976, very small quarters and tight hallways......if someone busts in it's going to be close quarters not ideal for even a carbine size rifle.
I'd rather end a home invasion saying wow, only needed 12 rounds than to be in the hospital or in the ground wishing I hadn't run dry at 12 and needed more. I don't have the precognition ability to know what I'll 'need' to defend my life, rather not gamble.
If I end up getting one I will certainly give it a test and my thoughts.
Buy me a P90 and I'll even compare the two.
Depends on where you live. My state has no arbitrary restrictions on magazine size.