Lately we're getting bit by bit to a higher level on our Nacra Inter 18. We've been advised during training by very good sailors on several settings to increase the boats performance, and therefore got a bit deeper into this topic. For that reason we are thinking of buying a Loos gauge to measure tension in the stays.

However after reading some forum discussions via the search function, made me doubt a bit. E.g.
1) I see several disccussions going on where people are looking for the right tension settings. If these are not available what is the value of the gauge?
2) I see some discussions going on about the accuracy of such a gauge.
3) There not very cheap, and therefore it realy should contribute

Could anybody explain me if we would benefit from such a gauge? What can it bring us?