This jam funnel is fine. For pity's sake don't spend any more than this. It does the job. Sometimes I wouldn't mind a slightly wider opening at the base for chunky chutneys, but then it would be too wide for my narrowest jars, so I deal with it and push through the chunky bits with the spoon. Whose kitchen is big enough to store two sizes of jam funnel, anyway?
It's surprising that they're not all made the same, really - how difficult can it be to design the perfect jam funnel, once and for all time? Haven't our engineers got something more useful to do with their energy? The handle isn't a lavish affair, admittedly, but it does the job. Assuming that you'll be using a spatula it's pointless spending more on a non-stick funnel which will eventually lose its coating. This one will outlive me. It ought to cost about 50p, but the laugh's on us as usual.