This really is not a PC, but a full-blown server, optimized for databases and (nowadays) accessing them via Internet. Used to be called a 'mid-range', somewhere between a mini and a mainframe.
So you're in for either a lot of programming or buying applications that run on such a machine.
Before spending a lot of money on a machine like this you have to know exactly what you want to do with it. I wouldn't even begin to think about it without hiring some IT-consultant.
I am looking into AS400/i5 series and was wondering if anyone had a any benefits of implementing it into a business. I know that this is kind of basic but I am looking for maybe some less known benefits perhaps from personal experience.