Well I asked a guy who sharpened my SB blades the same question. I told him I looked at the masports on their website the other day and he said you can waste your $ if you want but the SB's work fine. He said he had one a while back and the greenkeeper couldn't get it to cut below 5mm so he had to make him a new bedknife to fix that problem. Another person said the council they work for tryed using them for there work and they ditched them for SB's instead. SB's were stronger and more durable.
A bloke in my area has one and his lawn very very fine! Id own one if the price was right, but I sold a SB45 and kept a SB430 so my tastes in mowers some maynot agree with..
