The funny one is kennedy rda's. I know they are still hand built but my old sxk clone is identical in every way that I can test and see outside a lab. Same size, weight and visually same materials used throughout. Resistance seems identical (within natural variances) from 510 to post clamp but my sxk one arrived in far cleaner condition and in higher quality packaging. Overall as long as you keep your.receipt and provenance then your always going to get a reasonable to mental return if you move it on later.