The advantage of a close focus filter is flexibility as it allows close focus with non close focusing lenses (like for example my 25mm f1.4) and using one is very possibly quicker than using a life size adapter and there's less risk of sensor contamination when out and about.
I get that, like I said I've owned a few and they're great if that's all you need. They work very well on a 1:2 lens, but you're also adding that £60 on top if you buy new. You can find them used, but most who buy them tend to keep. The flexibility still doesn't match a true macro lens, with a couple turns you're back to standard and can go anywhere in between, with the Raynox as the example here you can stick it on and off [providing your lens filter thread is within the range for the snap on adapter] but all you get is the closest focus you can't just pull back with that Raynox on to get slightly less or indeed higher magnification. I have considered it of course, I consider all options, but an all in one macro can be much nicer so long as it's not a behemouth
1:1 is not essential for me, I do much more 'close up' work, but it's nice to know it's there when I do want to dabble. Not just insects either, but anything that looks interesthing to me in fine detail. I could go for a nice cheap 1:2 and seek out a used R250, it's not out of the running. You kinda get the best of both that way
Doing 1:1 or greater macro isn't for everyone, it's not only tricky but often requires extra gear and in turn, extra weight. You add a flash and diffuser and suddenly when focusing that close handheld every slight movement you make it's as if an earth tremor just occured! [I have spotted a nice, tidy and lightweight flash option though from Meike] The flash I own atm is big, hefty and bulky, it requires a trigger on cam and receiver attached to the flash also - if the lens is also heavy it really adds up and can be like a gym work out to shoot for an hour
I never use a tripod, unless it's indoor, pre-set up. Out and about I'm hand held only, I've had plenty of practice and feel I'm steady enough but it'll still take a few shots to nail one each time