I coverd this in my space wolf tactica but I would personally summarise it as being useful in a razorback unit if you have the points available after handing out the banner and extra power weapon or fist and then only add it to units which are eight strong or bigger after dishing out the upgrades again. It's good but not reliable and human nature of remebering either only good times or bad times with it will distort your own opions of it.
On most sites people either love it or loath it when statistically there is not much between it and taking an extra body instead. Potentially it can kill loads but the flip side can be that it can also generate up scant attacks and hits.
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