This gutter part and how to keep birds out

Carefully raise the lowest shingles on the roof line. Slip an additional shingle in under those shingles - install them oriented so the normally top edge of the shingle is the bottom edge (but make sure they stay face up).

Nail in place as high up as you can close to the layer of shingles above, leaving a 1" over hang over the gutter to create a new drip edge. Install using proper roofing nails.

Run a 3/8" bead of roofing caulk (black tar like substance) along the top edge of that new layer of shingles, then lay the old layer of shingles back down on top of the new drip edge.

The Rainhandler Plus might be OK if the ground around your home's foundation slopes at least 1 inch per foot for 6 feet or more and you haven't had water leaks in your basement or home. But you'll find gutter-guard systems that are better at capturing water for far less.

Consumer Reports 2010

My gutters are 3 stories above the ground level (it's a townhouse), so we had Gutterglove installed. It's been a year and we haven't had any problems. I previously had some cheaper screens on my gutters that lasted about 8 years before buckling from leaves (there's a steep hill behind my house so we do get leaves even on a roof that tall). I haven't had any problem with the gutterglove system, but it also hasn't been long.