This is a standard chinese plate loaded leg extension combo piece like many others.
I got this very cheap on black friday and has since been an incredible value for me.
Since it has a stopping pin, you can use it to adjust the starting position of the weight holder with a weight plate, so that the strength curve is actually descending instead of ascending. This actually feels very good.
You can also adjust the starting position of the movement to be quite stretched, which I have seen much worse on other similar pieces.
Overall, do not expect a high-end sturdy machine, it's cheap and holds up well - but not more.
In addition, this piece has the leg blocker that is mounted in the middle between the legs, so you need to remove this between leg curls each time you want to stand up, this is something other companies have solved much better.
On the plus side, it has a weight horn at the back - this way you can leave the machine even with the weight arm elevated without it toppling over. Most sibling machines are missing this.
Since I use it only single-leg, the weight capacity is absolutely OK for me (I load up to 70kg on it), everything still feels solid at this point, but you feel the bending of the leg pad, and also the seat is moving under you.
I doubt anyone will be happy with this piece when working both legs simultaneously because of the bend, except beginners. Anyone able to squat more than his own bodyweight will probably want to use this single-legged only.
Overall, you still get a very high value for the price (I payed less than 200 for it), and the resistance curve is actually quite good with the modifiable starting position. I have used this machine very frequently since I bought it, and am actually quite pleased with the purchase. Would buy it again for that price, but probably not for the regular 400 price tag.
Performance
Value
Build Quality