What you get with LSI:
Good service, for one thing. I can testify to that.
Distribution all over the world. They are “partners” with folks like Amazon.com and Barnes and Noble, so when you publish your book through LSI you are automatically listed on their partner sites. Through LSI, I have pages on Amazon and BN for my four novels (paperback).
Control You determine the price of your book, the discount percentage you want to offer booksellers, all aspects of your marketing. The cover you get is the cover you want, the content is exactly how you want it to be.
What you don’t get with LSI:
Inflated prices for printing your book. Go here for some cost comparisons.
Hand-holding. While the service is great, you have to do the work. And it can be complicated to get all the information into your account and the right files for your book uploaded.
However, if you could use a guide . . . ahem.