For me there are a number of reasons why the Higginson is an important part of my enema equipment. First and foremost, back in 1965(?), when Miss Norman, school matron, gave me my first enema she used a Higginson syringe and a Bakelite retention nozzle to put warm soapy solution from a jug into me! Seeing that syringe still has a huge psychological impact. The feeling of surges as she pumped, oh my goodness, is something I will never ever forget! Similar surges are created when my lovely colonic hydrotherapist kinks the discharge hose as she fills me.
Secondly the Higginson is a convenience. When travelling bathrooms can be small or there may not be something of sufficient height from which to hang a bag to create a good flow. Having a Higginson means I can, if necessary although its not very satisfactory, sit on the toilet while I give myself my enema or if the bag isn't hung high enough pump to achieve a good flow. When I need to take an high enema I use a Silicon Nozzles OF-13-FLY https://siliconenozzles.com/collections/specialty-enema-nozzles-3/products/of-13?_pos=2&_fid=9a8629977&_ss=c . I find that, because this goes around the corner into my Sigmoid, it can, just using gravity, be difficult to start the flow. A few pumps on the Higginson gets things started. I also find that, towards the end of the fill, particularly if I am gassy, the flow stops prematurely. For routine enemas I have a five quart OHN bag https://www.optimalhealthnetwork.com/5-Quart-Silicone-Classic-Fountain-Enema-Bag-p/204.htm and a venerable four quart Klystra bag, which I use when I take a herbal tincture enema https://cleansingherbs.co.uk/fluid-extracts-tinctures/21-enema-herbs-500ml.html and, needing to have a complete fill, use the syringe pump to finish off.
As I said earlier, I love the feeling of surges. They bring on great cramps, puppy pant those away(!) and lead to healthy releases. I’ve been fortunate to get to know a couple of very broad-minded colon hydrotherapists who were happy to talk me through how to do a really good enema and avoid any problems. Again cleaning and sanitising everything after every flush!