Betcha the mfr's option comes in exactly the same cost as having MorRyde do it.  Mfr buys them at a wholesale cost, then their markup brings it right back to full retail.  Frankly, I'd trust MorRyde's install over the mfr =any= day.  AND, since the mfr does offer it as an option, they can't deny warranty on anything except the IS itself, and maybe not even then.
Lyle