I'm real close (a couple of days) from buying one of these units, however, it has to be done without playing either. I've done a lot of research and thread reading and have found both brands to have very loyal owners. I'm mainly playing 5 string active fretless in 60's to now cover band(s). Weight is not an issue, my bandmates are real good at helping haul things and we usually have roadies. I'm looking to upgrade from an Eden 300 WT. I would really appreciates opinions based upon experience with both heads. So far it seems the Mesa has a thick punchy tone with solid lows, maybe a little light in the mids, with great volume. The Asdown might have more mid adjustment and a little more bottom end, maybe not as loud?