The amount of money I've spent on 'cheap' units and loggers, could well have been used to get me a real unit and the Solmeta seems to meet my needs. I am holding off so I can buy the one with the digital readout. Do I need it probably not.
But hey half of the fun of this is being able to work with the data.
Cheap ones work, better ones are going to be used. Avoid the ones that draw the power from the camera battery, unless you've a good supply of batteries on hand.
.. I set out to discover the inventions of God. -John Muir