I haven't heard or had anyone tell me they were one the new Magnum 1, but I did speak with a gent while DX'ing that was using the Anytone 6666, and he sounded very good to me. When I say sounded good, he was clean and clear and ON frequency. I stil like my Yeticom MK3, but they aren't made anymore, so most have to just find a different radio. The magnum 257HP's I had, which were 3 total, one survived. The other 2 are done for now. One is totally in pieces, keeping only what needed as the CPU and other components were toasted.
2nd one I sold. And the last one I got, which was from GI JOES as they were the only ones that had any, I had to pay $35 extra to have them convert it! What a joke as I did both my other 2 radios without any issue!! And they were suppose to tuned and aligned it as well. Not so. Center slot on SSB is off. And then I had a bad mic wire which has now burnt the last radio, and it's not working. If only they had built it with some better parts, and made a few small changes. The screen at night would kill your eyes!! I like the more Amber/orange type displays. Anyway, the magnum one appears to be of better quality build wise as they just used the clone chassis, added some of their components and slapped their name on it. Good radio for the price if you really think about it. Not sure what the AT6666 goes for, but im sure it's about the same as the magnum 1.
I have just found that HF radios work best for SSB use. And for what I paid for my base, which is an Icom 746 freshly back from Icom service center, with all bugs worked out, I am not complaining one bit. I still have my optima mk3 for mobile use and swear by it. I use it with a magnaforce 350HD, and it gets great reports!! But again, they are no longer available. Yes some had issues. But for what it's worth the amount of posts I have ever seen about any issue was either user fault, or factory fault. The radios themselves are one heck of an 11m SSB radio with a good antenna and the old Icom HM36 made in Japan hand mic. Sorry to post a text wall.
But from all accounts with the Anytone 6666 anyways, and from what I have heard as far as audio quality. For what it is. It sounded pretty good. Dead on frequency and natural voice. Just my experiences. And oh yes, I do like the magnum power mics a lot as well, the stock 257HP ones. Hopefully they sent a similar type with the magnum 1.
And it's nice to see you back around. Hope all is well and have a god day.
73 & God Bless.
222 Daytona Bch, FL
Sean.