Cheaper than Rolex, Omega, and extremely smarter also, and can do thousand more things than Rolex/Omega, and counting.
If you count cost per thing can do, it could be something like less than $5 per thing can do, vs maybe $1000-$5000 vs any highend watch.
Sometimes, value of what thing worth to our life may not be value at material cost, but how much it make our life easier, and save our time. For some people, each hour productivity lost could be more than $50+, so one day lost in productivity will get your $400 back.