I'd agree with everyone else on the homeowner sized chippers. I have one of the electric ones that chips 1 inch or smaller sized branches (it claims to chip 1.5 inch, but 1 inch is pushing it) and find it adequate for my needs. I only own a quarter acre though, and mainly use it for chipping up my prunings, laurel trimmings, etc, and also my neighbor's trimmings. I live in a county where all yard waste gets burned if you take it to the transfer center, so I feel better that I can chip it all up and recycle it into the ground. I've used mine pretty heavily, but like Mike said, it still hasn't produced anywhere near what you'd get from a tree service even with many days of use, maybe 2-3 small pickup loads worth of chips. It does chip up branches a bit finer than what you'd generally get from a gas powered or tree service chipper, which is great for me because they decompose so quickly, but some people actually want those chips sticking around longer.
All the 100-200 dollar electric chippers seem to be almost the same in design, I think the main thing is finding a company with a good return policy. Mine's broken twice now in 9 months of use, but they've replaced it free of charge both times. The third one I got stopped working after an hour of use, but I was able to fix it myself pretty quickly (power wire rattled loose inside the unit.) The returns are kind of a hassle because it generally takes 3 weeks to a month for a new one. Reading the reviews on other company's models (mine is a Sunjoe) I saw the same issues were pretty universal throughout the electric chipper world, but some companies are real arses about taking defective models back.