High Quality Product - Good Choice for me...
I use my Dowco Guardian Weatherall Plus motorcycle cover to help protect my 2013 BMW S1000RR motorcycle. I also own a 2011 BMW F800GS, which is covered with a BMW (OEM) cycle cover. The former is a new purchase, while the latter is now nearing its second birthday, so in fairness, I haven't had the Dowco Guardian product long enough to speak authoritatively about its durability or longevity. Let me also say that I'm extremely fortunate to be able to house my bikes in a covered, muti-story residential parking structure, parked inconspicuously behind my SUV, which means that they're shielded from direct sunlight, rain, wind, and traffic debris/hazards. My primary purpose in covering my bikes at all is DUST MITIGATION: I live in an extremely hot, extremely dusty/sandy urban desert area, where dust and sand particles are in a constant battle to displace nitrogen and oxygen as the leading components in the air! Hence, my motorcycle cover needs are admittedly perhaps not as demanding as those of you forced by circumstance to leave your lovely machines out on the curbside or in the parking lot, fighting wind and snow and rain, year in and year out. So, I will offer the following observations:
1. Each cover (both the BMW (OEM) cover and the Dowco Guardian Weatherall Plus cover) are decent - quite satisfactory for my particular needs;
2. The Dowco cover is made of a heavier weight material than the BMW (OEM) cover, which presumably might be advantageous in a harsh environment over the long run;
3. The Dowco cover uses an elasticized waistband to effect a secure fit around your cycle tires, where the BMW (OEM) cover utilizes a drawstring arrangement. In practice, I find advantages and disadvantages with BOTH styles: the Dowco elasticized waist is convenient, as it doesn't require fiddling with the dirty drawstring+plastic grommet arrangement of the BMW (OEM) cover. On the other hand, when fully loosened, the drawstring+plastic grommet arrangement of the BMW (OEM) cover allows easier, faster and potentially safer installation and removal (i.e. less frequently snagging a mirror, footpeg, or scraching a painted surface with what will eventually be at least a slightly dusty, dirty cover INTERIOR surface, particularly at and around the waistband, which is in contact with your tires, and very near the pavement surface). Not really a big deal, in my opinion, but make no mistake, the drawstring+grommet arrangement (as with the BMW (OEM) cover), once fully loosened, does allow somewhat faster, easier putting on and taking off of the cover, versus the elasticized waistband style of the Dowco cover;
4. BOTH the Dowco and the BMW (OEM) covers have eyelets on their waistbands, allowing use of optional locking devices;
5. The silver "metalicized" heat-shield paneling of the Dowco cover was and is an attractive (i.e practical) feature for me (allowing me to cover my S1000RR immediately after riding, when it's still very hot), although I will point out that this heat-shielding does not extend very high up the cover, so, while it is fine for the low-slung (OEM) exhaust pipe on the RR, it would not be effective (and therefore, would not be appropriate) as a cover for motorcycles with high-mounted mufflers (like my F800GS). Note that the BMW (OEM) covers have no heat shielding at all - they're not to be placed on hot bikes;
6. Sizing: after much research and review, I chose "Size: LARGE" for my Dowco Guardian Weatherall Plus cover, hoping that it would cover my ENTIRE BMW S1000RR, including the wheels and tires (my bike is mostly stock OEM, with the exception of a Zero Gravity "Corsa" windscreen, which adds an inch or two in height, and a few other small items (like rear sets and axle sliders) which have no affect on mass or girth). I am VERY HAPPY with my "size L" choice, versus the Dowco recommended "Sport Bike" size, which is smaller. My preference was for a cover which would COMPLETELY cover and conceal the bike, right down to the ground (without any baggy slop or "droop" on top), and that's exactly what I got with the "Size L" fitted over my BMW S1000RR: when fully installed, the elasticized waistband of my cover rests just a couple of mm's off the the pavement, FULLY covering the tires and wheels (which, though contrary to the image on the Dowco website [which shows a mid-wheel positioning], is just what I wanted), and the top and sides are semi-taught, like a tent, not resting on the tank seat, or hot engine/frame. Perfect!
With the possible exception of SIZING miscalculations, it's difficult for me to imagine any rider being unhappy with the Dowco Guardian Weatherall Plus motorcycle cover. It seems to me to be a quality product, quite capable and satisfying in fulfilling its intended purpose.