We love these - they are cheap, they have great designs, which Hobbycraft keep updating and they look wonderful when they're finished irrespective of how carefully they have done so they are brilliant for kids of all ages. Jessica has probably done half a dozen of them now. Like a packet of stickers they are a staple item that I pop into the trolley every time I go to Hobbycraft (that's right, I do need a trolley every time I go!).
That said, there are a couple of down sides. I am not complaining, just offering up some insight and advice. The kits come with plastic spreaders for the paint, which are reasonably effective but I have found that younger children find them a bit tricky to use so we always stick to using our own brushes. Secondly, once you've hung these suncatchers up in your window we have found that the colours in the paint fade fast. We hang ours in a south facing conservatory so they are put to the ultimate test and your experience may be very different. So, I have been encouraging Jessica to use my glass paints alongside the gelatinous ones provided in the kits. My paints don't seem to fade so we have ended up with some areas appearing unpainted when if fact they were originally completely covered in paint. Here are a couple that Jessica has done with a combination of paints. She has painted the J twice so it's not so obvious where the Hobbycraft paints have faded but all of the clear patches on the 3 are as a result of having been painted with those included in the kits.
Overall they are great value for money, the process is really good as are the finished products but they do not expect them to last in strong sunlight. We'll keep buying them!