Jean Williams Studio review for Lulu Direct

I tried installing the app but it appeared to be buggy. My one star is based on just that experience. I was thinking I might try it again, but reading these reviews, I don't know if that's wise. I'm new to Shopify and ecommerce, but I can read! It seems there is more dissatisfaction than there should be with the lulu app. I've never used them before. I'm awaiting arrival of a sample calendar I did that I'd wanted to offer on my store. I created the calendar on the lulu site and thought I could just pull it into the lulu Xpress app, but apparently I'd have to start over and re-do the calendar inside the app. But I see nearly as many complaints about service here as satisfied customers. Are there any other options that anyone knows about for print on demand books publishers who integrate well with Shopify and are more highly rated?