I became a ProAdvisor at my firm's managing partner's request and it's been fairly lucrative for the firm in terms of extra fees billed for QuickBooks training for clients. If you plan on using QuickBooks more in the future I would say go ahead and look into it more.
There are actually several different certifications offered through Intuit: desktop-based QuickBooks certifications available each year (with the option to obtain advanced certification after three different years of certification in this area), QuickBooks Online/Cloud, QuickBooks Enterprise Solutions, and QuickBooks Point of Sale (POS). The desktop-based and Online/Cloud certifications are the most pursued, I believe, but what certifications you look into all depend on what you're interested in or what training and/or services you'd like to offer to clients. I myself have certifications in all of the above because I was trying to psych myself up before beginning the CPA exam process and obtaining those certifications was how I did so.
I learned a decent amount preparing for the Enterprise and POS exams because I wasn't that familiar with those programs but I already knew most of the material for the desktop-based and Online/Cloud exams. Altogether, it took me about a week to prepare for and take all of the exams, and you receive your certification certificate and logo for marketing purposes immediately upon passing an exam.
I did enjoy learning more about some of the lesser known features of QuickBooks because my firm does use it almost exclusively and I also like adding useful certifications to my resume. 🙂
Oh, and one more thing- once you pass an exam and become certified you become what is known as a “Gold Level Member” and receive special pricing options that you can offer clients for QuickBooks products. My clients that have needed to purchase new software or upgrade have been very grateful for the discounts.
If there's anything in particular you'd like to know about the certification process, just let me know and I'll be glad to help!