Hi ChasKSC. This is my first post on the forum and I hope it helps, even thought you've probably already decided by now.
I have the Bissel Big Green Machine BT10, their full size carpet cleaning machine. As an aside and to get it out of the way, it is the best full-size carpet cleaning machine I have encountered, purchased after the dismal performances of the rental Rug Doctor or home machines. Mine came with the hose attachment, which seems virtually identical to that of the Little Green Pro. It works well as an extractor, and can spray your cleaning solution onto your carpet, but the cleaning action is simply scrubbing with the attached brush. I will spray with the Big Green hose and then use my Cyclo with appropriate brushes for the scrubbing, then extract with the BGM's hose. The weakest link in this system is the Cyclo; I really do need to get a different machine for the carpet scrubbing.
I can't speak to the power of the Little Green, but the manufacturer claims a current draw of 5.7 amps. The Big Green has two motors, one for suction and one for the rotating carpet brush, and is listed at 12 amps. I don't know if those two motors in the Big Green are equivalent, and of course don't know if the Little Green has the same suction motor as the Big Green. I have no experience with dedicated water extractors, only with my Big Green, but I
can say the the Big Green really sucks. I'd had a problem with the cleaning fluid valve leaking, and Bissel took care of it, via a Vacuum Sales place in the next town over, without question and very quickly.
As I'd said earlier, I have no experience with commercial extractors, and I am not a pro. I'm actually not too fond of cleaning auto interiors; like many here, I enjoy making the paint look pretty. If you're using the extractor for personal use and you also have carpets in your home, then I can't recommend the Big Green Machine highly enough. It will take care of your home and your car(s). I cannot speak to either Big Green or Little Green with regards to their abilities in a professional interior detailing environment.
FWIW, I've been doing personal detailing since the '70s (although back then, with the junkyard car I'd had, I'd only get my Fiat polished up after I'd let it go chalky, all handwork of course), and in the interim have done multiple Porsches, BMWs, and an absolutely freaking gorgeous Ferrari 360, and am just now working towards starting my own detailing business; I already have two customer cars in my care, woo hoo! If you see this message, please let us know if you'd gone with the Little Green and how well you think it does the job. It may well be worth my while to eventually replace the Big Green when working at a customer's location, for the Big Green is a bit of a beast. Ha, I have two beasts now: a Big Green beast and a Supa-Beast. (A great big
THANKS to Mike and all on AGO for all of the intelligent, thoughtful, and useful information and the work that goes into placing it here. Due to the fine efforts of those here on AGO, there is also another beast in my arsenal: ME! OK, I was a beast before AGO, but now I'm turning into a Polishing Beast...
I've recognized that I've violated the forum rules by discussing a product not sold by AG, but since Mike had replied I've taken that as tacit approval to reply as I have. If I've erred, please take this post down, and my apologies. Also, I've edited my insinuated description of the Ferrari to "freaking".