I have had two Magnum 257Hp's in the past six months so I think I can chime in here.
I mostly DX and enjoy working all frequencies....
The first 257Hp only lasted a few minutes:
I had expanded the frequency and turned up the modulation it inside the microphone first.
*Initially the transmit and receive was awesome and had several favorable reports through a Solarcon A99 up 40'
*Then switching through the modes, SSB power decreased down to 15-20 watts and reports came back as weak and muffled.
*AM was fine.
*No matter what I did, power never came back up on SSB.
*Radio was a pig.
My supplier readily took it back and dropped shipped another 257Hp.
When the second 257Hp arrived:
*After I opened the cover, noted a speaker wire disconnected from speaker (cold solder? a resold radio?). Quick resolder fixed this.
*Performed the frequency expansion and modulation pot adjustment.
*Again this radio never had many reports of sounding loud both local and CQDX.
*Modulation LED sometimes showed my modualtion on SSB.
*AM was OK.
*Otherwise the radio was again a pig.
Emails to Sam Lewis led to a phone call and the radio was sent off to the Radio Shop in Ontario, CA. Some five weeks later, the 257Hp came back with repaired external speaker jack (I had never used the speaker jack before, so again thinking this was a resold radio), a software upgrade, and re-biased SSB (what ever that means).
So far, I have had good reports of the radio in the mobile. Power meter shows 80 watts max RF power and since then we have turned it down.
I have to admit, Mr. Lewis was prompt in getting it repaired. It still has a 1.5 year warranty on it.
It has been an interesting journey. Intend to run this for a home QTH station with a Sirio Gain Master.
Lastly, I will add, Copper's has the most "horrible" return policy that is not listed on their website. They will not reimburse you for all shipping costs if an item is simply defective and you want a return. Our family has owned several businesses (to include metal fabrication and an accounting firm) and it is not good business to "rape" a displeased customer.
I will go out of my way NOT to support Copper's. They are an awful company.
You may have had a favorable transaction(s), but if ever you need to have any customer service that includes a full refund, you will be left holding onto your pecker.
ps: I $hould have had li$tened to my Elmer.
It would have saved me a lot of money and headache.