hi there<br /><br />I'm about to purchase a new switch box for my merc 850 and I have a couple of options? I can get a sierra for $145 US or a quicksilver mercury one with 12 months warrenty for $170 US. Is there any difference between these apart from the fact one has a warrenty. Have other ppl used sierra switch boxes before, I see that is what they sell on this website so that must be pretty good. Any input would be great.