I'd like to help mate but it's hard to give a definitive answer to those two questions. So much depends on personality and circumstances.
When I had the M-Audio AV40 ( > 85Hz) turning on the big flooorstanders simultaneously had an immediate impact on the gravitas of the sound. I quite often used then both together. The ADAMs quote a lower figure (> 60Hz) and to my mind it makes all the difference. I stopped using the flooorstanders 90% of the time. That's why I relegated them to another room and bought a sub instead. I still don't use the sub all the time and rarely at night. That's an significant advantage. Being able to click a footswitch and eliminate 90% or the potential annoyance is great.
You do need to bear in mind though that I'm using the ADAMs as multimedia speakers. I'm as likely to be watching a film on telly, chatting to my mates on Teamspeak or listening to the radio as banging out tunes. Not only that but I rarely listen at anything like the volume I might have preferred if I was 20 years younger and didn't have family or neighbours to consider. Basically when I'm on my own I listen to the ADAMs only. If there are more people around I turn on the sub and nudge the gain a bit. You would deffo need some augmentation if you were having a party. Prefer precision to power these days anyway so it's all good.
I suspect if you measured the off axis response and compared it to dedicated hi-fi speakers the hi-fi speakers would win. Never found it an issue though. ymmv. As far as filling a room goes ...... not a problem spl wise. They go incredibly loud for such a small package. 4x25W RMS amps. They are designed to run hot for long periods as well.