Not the strongest, obviously since it is a small portable, but does what I wanted it to do, which is mainly to power wash my car. It is easy to set up, and use, what more could you ask for. No gas fumes, no cord pulling, no hard starting. Just hook everything w, plug it in and press the On button.
I've used a gas power washer in the past, and just had my 10 year old electric power washer fail.
I had to clean a heavily moss covered walkway in the back yard (doesn't get much sun). I prefer electric power when ever I can, and this was listed as 2500 psi. I was hoping it would do OK, and not take too long to do the job. To my surprise, it did as well as a gas powered pressure washer. Plus unlike my old electric, it uses standard power washer parts, so I can replace tips and use other standard attachments.
Needless to say, I'm very happy with the purchase!