Hi Curious,
Purgatory is absolutely correct in that HIFU is not yet approved in the USA, or the UK. I believe, but I'm not certain, that it is 'approved' in some other European countries. I'm afraid that the claims regarding HIFU have, in some cases, been somewhat over-exaggerated, which has understandably led to a degree of uncertainty about just how good or not good it may be.
As Purgatory says, HIFU has side effects and risks associated with the procedure. A little bit of Internet research will probably make these clear, as long as you stay away from the websites run by the manufacturers of the HIFU equipment!
One of the main concerns about HIFU at the moment is the lack of a longer term oncological data. Biochemical success after five years is possibly in the same ballpark as other forms of treatment, but once you get to 10 and 15 year outcomes HIFU does not have 'solid' data, compared with surgery, brachytherapy, and EBRT. I think this lack (so far) of longer term data is particularly relevant when considering someone as young as your husband.
Having said all this, I have opted for HIFU after spending a considerable amount of time considering other options. However, I am 12 years older than your husband. And yes, cost certainly is a factor. I shall be spending quite a large amount of money to be having HIFU treatment privately. My treatment is scheduled for 30th October.
It has been repeatedly stated at this forum, and at others, that perhaps the most important decision alongside what type of treatment to go for - if any - is to choose a surgeon who is very well practised in whatever procedure you choose. If you decide to follow up on the possibility of HIFU, you will see that there are two different types of equipment used for the procedure, both of which claim to be the superior method and which utilise slightly different techniques. My own feeling is that the experience of the operator is of greater importance than the type of equipment.
If you go to the Yananow website (http://www.yananow.net/Links.html) and click on 'Experiences' you will find there are a large number of stories written by people with experience of various forms of treatment for PCa, including HIFU.
Cheers,
Jeremy