Can't say much about the tech but the reps sure know how to soak the money out of you. Bought one DIRECT FROM LUPE @ $649 only to find out a couple days later they had a "September" promotion @ $599 (I purchased the vacuum in September.) Wrote and asked Julie Tyler if I could get a discount on the battery being they didn't give me the promotion price and I'd have been happy with even something under the $50 extra I paid. Julie Tyler emailed me a "Special Price" of $121 for a 2nd battery. A one dollar INCREASE over what one pays for a 2nd battery at purchase. Technically okay but extremely poor business practice. I would have posted several positive reviews which I noted in my correspondence but now....as I said to Julie Tyler, I will (and DID purchase online the 2nd battery at the $121 price) buy the 2nd battery but I told her that I just don't think I'll have the time to post any positive reviews. So my issue is not with the vacuum, though I won't say anything about it good or bad being the company is so stingy and poorly managed. What do you think?