Many QRP enthusiasts have used the various TenTec Argonaut transceivers. I never have, so what follows is not from personal experience. The latest Argonaut VI misses 6m, 12m, and 60m and seems expensive, at least here in the UK.
The image on the LHS (above) resides on the www.eham.net site and will be removed if linking to it is an issue.
To identify the older Argonaut models, Ten Tec have a "knowledge base" page to help. See
http://www.tentec.com/pages/Identifying-the-Argonaut-transceivers.html . Although the latest version is said to be very good, I am afraid I'll not be buying one. Price needs to be £799 or less in the UK and it needs the missing bands before I'd even look.
There are 22 reviews of the Argonaut VI on eHam.net. See
http://www.eham.net/reviews/detail/10849 . At an average of 4.5 out of 5, the score is not that good. The FT817 scores much better. People seem to love it or hate it. It apparently has a very quiet receiver and a very simple user interface.
I see that Ten Tec have dropped the USA price of the Argonaut VI to $849 for a package that now bundles the mic and 700Hz CW filter too. I suspect this is a desperate measure to shore up sales. It would not surprise me if they went bust. Personally, I think the latest Argonaut VI was a mistake that Ten Tec now regret. These are
personal views. I hope they survive and thrive, but please reduce the Argonaut VI price outside the USA too and, for goodness sake, add those missing bands!
Their
Rebel open source CW rig sounds far more likely to succeed in my personal view.
Ten Tec is reputable make, not Japanese or Chinese, and I wish them well for the future. The commercial world is a tough place, so take nothing for granted.