Should I invest in this tack?

If you don't intend to show, and just want some English tack for fooling around home, go for it. Are you looking to use this on your stud? It'd be fine for him as long as it fits him. If you decide that you really want to take the English route, invest in some better quality tack for showing. I bought an all purpose saddle for $250 at a local tack shop, and it's served me great. I've even used it to show once.