I bought this the week we got the puppy. I had owned three rugs, all white, all chosen before any reasonable adult would have approved them. Within the first month she had thrown up on two of them, and the third had a coffee stain from a separate, unrelated incident I would prefer not to elaborate on. The Little Green Pro pulled all three out, and the rugs are still in the apartment.
The trick is the suction. This is a small machine — about the size of a toolbox, maybe nine pounds full — and it sounds like a hair dryer with bronchitis. But when you spray the cleaning solution onto a stain and run the nozzle over it, the dirty water that comes back up the tube is a color you do not want to think about, and the spot it leaves behind is genuinely clean. I have used a rented Rug Doctor once and a steam cleaner twice; neither pulled as much out of a couch cushion as the Little Green pulls out of one in five minutes.
What the Pro version adds over the original Little Green is mostly hose length and a slightly more powerful motor. The longer hose actually matters — the original required you to set the machine on the surface you were cleaning, which is impossible if the surface is, say, a car seat. The Pro reaches across a sofa or into a backseat without you having to balance the unit on a cushion, and the suction strength means it pulls more of the cleaning solution back out, which means less drying time afterwards.
The two-tank system is the design that makes the whole thing work. Clean water and solution go in one tank, dirty water comes back into a separate tank. You can see the dirty tank fill up, which is a deeply satisfying piece of feedback — you watch the level rise, you watch the color change, and you understand exactly what your couch has been doing for the past three years.
The complaints are all about the tanks. The clean-water tank is fiddly to fill — you unscrew a cap that sits inside a recess, and water inevitably ends up on the floor. The dirty-water tank requires you to pull the whole assembly off, twist a cap, and pour the contents into a toilet, and if you have not done this carefully you will spill some of the worst water you have ever produced onto your bathroom floor. After a few uses you develop a routine. Before then, prepare to laugh-cry once.
It is also loud, which I mentioned, and the nozzle attachment is plastic and feels like it could crack if you stepped on it. The cord is shorter than I'd like for working on a car. None of this changes what the machine does, which is rescue furniture and rugs from the otherwise-permanent.
One hundred and fifty dollars, give or take a sale. I have used mine probably forty times in two years. The math is not interesting.
Verdict: Buy this if you have pets, kids, or furniture you actually care about. If you have all three, you should have bought it already.