I believe the surgery is a bit specialised, certainly my urologist did not do it but referred me to another of his colleagues that did ( and I think he used to train others too). I believe the data is for 5 years... but also believe that's because its a relatively new procedure and that's about as far back as the data goes.
I too lived with BPH for years - very frustrating having what is commonly referred to as an old mans disease when in my mid 40's. I am most certainly the youngest in the urologist office everytime I visit! .... finally stopped the medication as I did not like the side effects of interfering with sexual function ( I did try several alternatives). I think that was also on the mind of the surgeon when he decided I would be a good candidate. So to sum it up, for me, good flow afterwards and a happy wife!
Just realised this is the second time in a week that I have answered your medical queries - sounds like you and I have had some similar issues!