The Sirena is not a bad machine.
There are several threads devoted to the Sirena, most all of them are positive.
If you have a customer that is wanting a water vac, maybe has seen a Rainbow demonstration, or is replacing an older Rainbow. The Sirena is a good alternative. In my case I have a 40 year old chrome dome Rainbow, I wanted a new one but my checkbook was adamant that it would not happen. I was able to find a great deal on the Sirena and am happy with the purchase.
For approximately 1/3 of the price of a Rainbow you get a machine with 30 CFM more airflow. The basin is larger, but the design causes more clean up on the underside of the machine. I do, however, feel the wider opening makes cleaning the basis easier. No lighted basin, or direct connect wands. You also won't get the brushless motor, but you do get a very well built, "Italian designed" motor built in China.
As I have mentioned before. What I would like to see as improvements: 1. A longer hose. Two to three feet would do wonders. I am not in love with the power nozzle. I personally don't like the way the adjustments are labeled. I wish it had a 1-2-3, or . .. … . My last wish, I wish it had a headlight.
I hear some here on this site mention that they have one in their shop and it just sits there. I feel this is a machine that will have to be demonstrated, and sold. I doubt that you will have many waiting at your door for when the store opens begging you to let them by it.
Many, not all, American buyers are like me, again not all, but statistically and historically we don't like canisters. We are upright people. So you will be challenged with selling a canister vacuum with a power nozzle, as well as selling a machine that requires a bit more maintenance than wrapping the cord and stuffing the bag full of dirt back in the closet.
Unless your shop is going to be exclusively Sirena, I look at it being a niche machine. It may not be your highest volume seller, but it is a viable option to those that want or would like a Water based machine.
Came back to add:
The only problem I'v had with my Sirena in three years was a broken fuse holder on the power nozzle. Which the company immediately sent me a replacement with instructions to do the repair myself, or offered to have it shipped back to be repaired at their center. The repair was so simple, i was able to do it in about 10 minutes.
[this post was last edited: 8/27/2018-13:51]