Glyn has said it all. Some people prefer one make and stick with it. As long as it does the job, then there shouldn't be any problems.
I did Prochem courses so i went for a new Blazer plus because i had seen them, but had i of seen a Hydramaster i probably would have bought from them.
Coincidentally, i received a card in the post today from Hydramaster and obviously they think i still use a portable machine. If you have a portable in good working order and you are the original owner, they will give you a £1000 off the cost of a new Spitfire 3.2 model. Worth looking at.
Dave