I generally park it when I drive to work.
So, it sits all days under some trees with a few hours of direct sunlight.
Am open to all suggestions (either full or half, expensive or cheap).
Just wondering what your reasons were for why you chose them, and how you feel about them after using?
I cover my bike because it sits in direct sun at work all day, 5 days/week. If the sun's not baking it and UV fading the plastics, it's getting rained on. I camp off the bike so dew and overnight rain are an issue, too. I can store my helmet and jacket on the bike under the cover, too - even in the rain.
I use a "CoverMax" half cover, I think it was an XL size. It covers my fairing down to the turn signals and goes over a Bestem top box. I can get the top of my 21 L panniers under it, too, but the 36L panniers. It's held on by elastic around the edge and a strap goes down to each footpeg.
It's seam-sealed Sil-nylon underside - just like the rainfly on a tent. It's light and packs down into a sack about the size of a 1L Nalgene bottle.
It has kept my plastic looking like new, kept my RDL saddle dry, and keeps passers-by from swinging a leg over.
It's about 2 or 3 years old and has finally torn a little bit after flapping in the daily thunderstorm winds at work so I'm looking to replace it.
HERE IT IS
This is NOT something I'd use to cover a bike stored outside over the winter, or while being towed on an open trailer. It's just for keeping sun and rain off a parked bike for a portion of a day - it's made to be small and lightweight, not sturdy and bullet-proof.