Technically, most is already said here, but the reason I would never trade my trusty Rycote-kits for Röde is actually all acoustical.
The Rycote does by all means lose a lot of high details with the zeppelin on, and even more with the fur, but it's quite neutral, and honestly it's completely impossible to get a windshield that doesn't affect the sound at all, so I must say I'm very impressed by this system considering gains versus losses. And I absolutely love the suspensions!!!
The Röde-blimp on the other hand sounded much more restrained and lack-luster I think. It was, literary, in comparison like powdering gray dust over a camera-lens. As far as I can say, the Rycote is great at fending off internal reflections, but the Röde is not. I think it felt a little like the old DV-cams I played with in the beginning of the 2000's, though not by far as sickening. Their sound was greatly affected by the capsules mounted sloppily in a crappy casing of very cheap plastic and gave a very annoying resonance-flutter in the higher mid. I feel the same effect in the Röde-blimp, though it's MUCH easier on the ears and more focused on the lower mid where you're much more likely to filter anyway.
One other thing that annoyed me was balance. My Rycotes are balanced with the handle in the middle of the blimp and with the rear suspension all the way back on the mike and the front suspension halfway up the tube on the shotguns, and nearly all the way (or as far as it allows on MKH-40) up on other mikes. On the Röde I didn't seem to really be able to change the positions of pretty much anything, so it was much harder to get a good flow in the work as all weight was too much off.
When it comes to sturdiness, I have no clue how much the Röde can take, but my first Rycote has gotten many a good beatings over the years as I do tend to work in pretty unhealthy situations some times, and the only time it took any damage at all was while on location an extremely heavy steel security-door the same construction as safe-doors got slammed right on it. The door was heavy as hell (we where recording at a place where people have all reason to do their best to keep burglars out...), and yet the only thing that happened (except me nearly crapping my pants) was the part between the handle and the rail got slightly warped in a perfectly straight angle.
Pretty impressive, actually! As I said, the door was frigging massive, but still there was absolutely NO damage whatsoever on the mike (a Sennheiser MKH40) nor my K-Tek Klassic boom! :-D