What are the best backpack sprayers and fertilizer carts?

[Holland]

Newbie looking to purchase a couple backpack sprayers and also a fertilizer spreader. What do you guys recommend for commercial use?
Thanks for your help!
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[Holland]

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[LandFakers]

I have head great success with my RL Pro Flo. I have had it for a while and it does a great job. Only have to do one thing which was replace the seal on the cap but that's been it so far. Not sure if it's commercial but it doesn't a great job for me.

[LandFakers]

Here is the same sprayer That I have. They have it listed under commercial so I guess it is.
http://www.rlflomaster.com/commercial/614.htm

[cpllawncare]

SP systems probably has the best. My Stihl does good, I would go over on the pesticide herbicide application thread and ask those guys.