We have a set of the el cheapo ebay mudflaps on our car - no complaints this end - seem to do the job, haven't fallen off at high (or slow) speed, people travelling behind have not complained of spray and look fantastic IMHO....
As for fitting - a few screws and a spirit level and your laughing, of course you will need a willing assistant to hold the spirit level while you fit - funny how the women seem to get this job PM Swiggi for details....
G