I am using these with my now 8 month old son (started a month ago), and I wish I'd had them for my first. I'm giving them to everyone I know with weaning/teething infants. My son figured it out right away and loves it, sometimes for the food, sometimes just to gnaw on the handle. It's perfect at restaurants to pick out bits of all the grown up food for the baby to try (my oldest loves sharing) - it enhances both kids' experiences. It's also great for the obvious feeding more whole foods at home to let the baby experience new tastes/textures (not much diminished by the net as far as I can tell). And on more occasions than one, putting ice in there to aid teething pain has saved many tears... even just to soothe baby's mouth so he can go back to eating his regular meal.
Some reviewers mention the difficulty with cleaning some foods (esp. banana) out of the net, but I have found it's not too hard... getting the remaining food out can be slimy, but rubbing some dish soap around the net (inside out) with my fingers and rinsing well has worked easily every time. It's dishwasher-safe, but mine has not been effective on messy nets, so I stick to hand-washing that part.
The only downside I've experienced is that there's no good way to attach this to my toddler, and when he drops/throws it to the floor, it can need a rinsing before I'll give it back (wet nets attract much). I like the chunky, easy-to-hold handle the way it is and prefer that design to some that are more like large plastic loops, so I would not use a different feeder, but it seems a small loop on the end of the handle that would allow for attaching would make this a truly perfect product.