John I also have been on here for a couple of weeks and I see a couple of people have had issues. It is the discussion about it that has gotten huge. I use an HF Packer amp that uses the IRF510s and have not experienced any failures. Out of the box the uBitx will work but by our nature as hams we like to tinker and adjust to see what improvements we can get out of our equipment. With out proper test equipment these adjustments are difficult at best. One of the ham having problems appears to lack enough test equipment (an Oscope and RF probe) to see the RF flow through the TX chain. Plus as pointed out many times the IRF510 is a switch after all and needs some kind of dc load inline between the supply and ground otherwise puff out comes the magic smoke.
Skip Davis, NC9O
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Skip Davis