I saw Dr. Petrov speak at SUNY - he reported the best success rates as compared with Kuwait and Albany - but Poland and Germany were not represented. Of those at SUNY: Kuwait was the most aggressive with ballooning - but really took their time with it as they were not allowed to use stents at all (the folks in Kuwait have an international clinic in Egypt); Bulgaria used the second largest balloons; and Albany used the smallest balloons and were questioned by the audience about undertreating.
It seems natural to think that complication rates might be linked to balloon sizes, but there was no data provided to suggest this. There was data to suggest that success rates (i.e. percentage showing improvement at one month) was proportional to balloon size. In any event, it's still very early days - and probably too early to tell what works best.
What was abundantly clear, was that you want the most experienced individual doctor possible - the more procedures these guys and gals do, the better they get.
There are different physicians performing the procedures in each centre - and individual physician complication rates are more important from a risk assessment perspective than centre complication rates where multiple physicians are doing the work. This is an important question to ask - who will be doing my intervention and what is the doctor's personal complication rates in doing the procedure?
The problem noted above by Cece [also] occurred to a friend of mine at Albany, where they use smaller balloons, and generally seemed to have low complication rates. Sadly, one of her veins is now completely thromobosed [sic?] - and no one back here in Canada is allowed to help her. [That having been said, my wife is still going to Albany on Monday - and we can trust that these doctors learn from their mistakes - having honestly reported them.]
I think Dr. Simka in Poland is rumoured to have the better success rates; and he has almost certainly done the most interventions. But is he the doctor who will be performing your procedure if you go to Poland?
The success rates quoted for Germany were the lowest I've read 50% showing immediate improvement, 45% showing no difference, 5% getting worse - but these numbers all come from early July - and everyone gets better with practice.
Best of luck with getting a time and having a good experience