It is comparable to K-othrine, which is twice the price. My problem in the storage room is fleas. For an alternative spray, Draker is very good. In the past, I have used K-othrine, Fedona, Icon, Actelic TRIANOS, and others I don't remember, but the ones I mentioned above (Sharda and Draker) I found more effective, and you don't pay for "brands."
Fleas are the plague; I don't bother with mosquitoes. For cockroaches, I make a paste with boric acid from the pharmacy, and it's the best.
Read below the comment from the reviewer DrDiesel, he is well-informed.

I have used deltamethrin from another slightly more expensive company before, and this year I decided to try it as its price is quite good. I sprayed a bag inside and outside the apartment (75 sqm) a month ago. I was not satisfied. When I had sprayed with another company's product, the next day I saw many dead bugs in the yard, while with this specific product, I only saw 4-5. For 4 weeks, I saw a few live bugs inside the house, so I decided to spray again with another bag. Unfortunately, they reappeared after 2-3 days... I would not recommend it.

The best thing ever, I tried it for mosquitoes that I have at home (detached house) but also for ants, spiders. I don't know its duration but it's perfect. You spray it at night and it smells a little.

I did not see a big difference in the results. Unfortunately, I had to switch to another brand and noticed a significant improvement

K-Othrine (the Original by German Bayer) and Delta-methrin (the generic by Greek Farma-Chem) and Killmethrin (the generic by Indian Sharda) contain the active insecticide substance Deltamethrin in a concentration of 2.5% by weight (sold as a powder that dissolves in water). In my opinion, there is no better insecticide (flies, mosquitoes, cockroaches, etc.) that is as safe for humans. The only drawback is that it leaves a white powder on surfaces after spraying. PERFECT FOR EXTERNAL USE. Alternatively, use Solfac (by Bayer), which you can even spray on the mattress you sleep on.