I asked this question a short while ago and did get a couple of answers, with a link back to a much earlier post from someone else.
I think the general consensus is that it can help with impacted soils (bird poop and the like) and if you have money to throw at it then why not.
There are alternatives to the glitzy package from ionic if you can live (and sleep at night) with the retro look. The diesel versions from Eberspacher not only offer the same water temperature but will also heat your vehicle and equipment to boot on those frozen nights for under £1,500 depending which version you want.
There is also a bottled gas version (under £1,000) from a well known wfp supplier but don’t depend on them selling you it, as when asked the answer I received was " yes we do sell them but what do you want one of those for"
Some one else also reported on here that they had great success using a caravan/RV water heater.
I am not knocking the large resellers as with theirs, you will get a safe and tidy package which they have dedicated time and money in putting together for you, but if you cant afford it or in some cases you don’t want to be dictated too, then there are options.