i like to read the sha vs bing threads. especially when ken chimes in. my favorite part is when it is scientifically explained that some brands "like" sha's and some dont, even though they are all piston port and extremely similar.
theres something like 2 dozen sha slides. learning how an sha works and getting familiar with the slides and why they are different is the key to tuning an sha to be every bit as good as a bing, but it does take time, research, and experimentation to get to know them well enough to tune them correctly.
most people dont bother, so they take a big dump on sha's instead of learning anything about them. it doesnt help that 90% of sha's come with a slide thats not correct for their set up.
take some time to read up on sha's. get to know and understand them well and you'll end up putting them on everything.