And a good machine for the price. 

this unit compare to Rexair/Rainbow units? There's something about that blue PN I don't like, but would have to try it out in the flesh.

Kevin

The Sirena is a good machine.  I would say would compare more to an older Rainbow.  It does not have a brushless motor.  No direct connect wands.  Moves 90 CFM on High.  a bit larger water basin. Both Sirena and Rainbow are water based/separator machines. 

 Like I have said previously; I am not a fan of the power nozzle.  It's not a bad nozzle,  there is a very large dead side where the belt runs.  It does, however, seem to do a good job cleaning.   I don't care for the adjustments.  I wish there were more settings, and they were more clearly marked.  I wish it had a headlight. I think these are just my preferences rather than negatives with the nozzle.

I wanted a new Rainbow, but my checkbook said I couldn't have it, I got a very good price for a new in the box Sirena on Ebay last February.  I have had no complaints in the last almost year I have owned mine.   Any questions you have Sirena has responded within a day with an answer or solution.  As I was saying to myself yesterday, "would you buy another one?"  "Yes, self, I would."

I was thinking about maybe picking up a used Rainbow D4. We had two Rexair's growing up for our hard flooring and Hoover uprights for the carpeting. Last new Rexair was probably early to middle 60's, that I remember anyway. I think the first one just had a bad cord, but they wouldn't let me fix it(I was probably 12). No power nozzle for the second one, but maybe because mom opted out...dunno. So I looked through the Rainbow history site and the D4's are somewhat affordable, but the prices vary wildly on eBay.

That's why I asked about the Sirena......

Kevin