Poopfeels

I'm assuming a lot of people that started with rocksmith ended up using their cables for ampsims like amplitube, bias etc. This is where I am now. I'm fairly satisfied, I dont get any perceivable lag and the sound quality is great, but I'm wondering if its a case of 'i dont know what im missing out on' If I bought a device like the UR22MKII which is my current top contender, am I likely to see a noticeable difference that would justify the cost? I'm already using relatively high end headphones. The only thing that really bothers me is this faint background hum that is present on basically everything I do when I push the volume, but I cant tell if thats just normal or caused by my current setup.

as a total beginner, id actually love something like this maybe basic scales/arpeggios on bass too!