Ya, some text might be nice. There's a lot of empty-ish space and that would help fill it up. I think it's pretty good, but the effects are somewhat repetitive.
It looks alright but it's not really "popping" imo. It could use text as mentioned and I also think that better lighting would help this sig a lot.
Errrm...now it looks like the text stands out way too much. I'd try to make it a little more vague. Maybe put it in another location and fade it/blend it.
I love the contrast on V2, but not too fond of the lighting on the second. Add more lighting on that version. Text is meh. BG is kind of repetitive.