Hi - I have used Alfano, MyChron 3 & 4. I also repair them all and make sensors for them (www.kart-crazy.co.uk)
In my opinion the Alfano does as much as 90% of people what or need. It tells you your lap times and max revs. However I find the two button control often leads to lossing the data I want to view. MyChron 3 is great - very easy to use. MyChron 4 is also good.
However I do think the MyChron 4 head unit has reliability issuses (in my opinion it is not well made for the conditions it works in). If all you want is basic details buy a used Alfano - for about £125. Used MyChron 4s are £170+ and much harder to find.
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