Richsubarusti

Hi , I was wondering about sequential shifters and wanted to see what people thought of them. I know some might say you can shift as quick with a h pattern maybe ? .and I know they seemed well over priced but did anyone have one and was it good /bad . Also I wonder why they stopped making them ,as a while back I looked At the different companies like ikeya ,S1 ect and it seems they don't make them any more . What do you think ?