for those of you who clean gutters (already read all the debates about it) what are your opinions on gutter guards. got a customer who i cleaned gutters out for last week. he asked me for a price on installing gutter guards. told him i've only ever seen one design that i thought works and would recommend to him (don't know what brand and neither does the homeowner that has them). haven't been able to find it and not sure what to do about it now (recommend none or recommend another design/brand). figured i'd check with you guys to see your opinions.