I've bought Nazgul DYI set. I hate it. I don't know if that was me building it wrong or what, but the iFlight's stack is one big piece of crap. I've got all components there from iFligth and I hate it still. I threw it away on the bottom of my closet and instead of this I bought Apex Evo frame, Speedbee F7 v3 stack and HGLRS ELRS receiver and it flies now better than great :)
I can only say that that was great decision to not buy Nazgul. Although for example Bardwell is very pleased with the Nazgul Eco, but only in analog :)
I'm sure you're gonna have tons of fun flying Nexa :) It's light, motors 1404 4600 KV if I'm not mistaken. They give really tons of power - sufice to say - I have 1404 4600 KV on my Volador 3,5. Amazing weight to power ratio. :)