Mine has worked well for several years. However, with the combined duet you can only offset the keel depth, not the depth from the waterline, so you can either have depth below the transducer or depth below the keel, but not depth of water the boat is floating in. Mine is set for depth below the keel and I am happy with this - if I want depth of water I mentally add my draft. The seperate depth instrument can be set up to read depth of water, but then you lose the advantage of a single instrument for two functions. As mine is a few years old you might check with NASA that this is still the situation with current instruments. They are very helpful on the phone.
I also have a clipper duet - I think it's also about 7 years old - whilst it's a really clear readout which I like, the log tens to be temperamental.
The paddle wheel needed replacing a couple of years ago - one of the steel inserts had corroded and come out, therefore the unit was only reading half speed.
Now I find I have to take out the unit from the hull most times I go out - there is usually very little weed / barnacle, but I have to clean it two or three times to make it work.
Finally, the plastic instrument cover degrades quickly with UV - justr replaced mine this season
Would I have another unit if it died - maybe, but I'd seek advice about a more reliable (expensive?) unit first
Have you checked the spindle that the paddle wheel rotates on, mine was tempremental. I noticed that the paddle appeared loose on the spindle when I pushed out the spindle I found it to be almost flat. A replacement wheel and spindle cured the problem.
Peter
I had one on Aurora for several years. Very competitively priced (cheap). Had problems with the paddle wheel which generally needs replacing annually though they are cheap items. I'm sure that the depth can be offset either way ie depth under keel or depth of water.
I now have raymarine which so far has proved more reliable but also is more expensive.