Seems shaky at first
When I first received this item and took it out of the box, I immediately felt that it was unreliable and dangerous to put my baby in. However I gave it a very careful, supervised chance and kept an eye on the cheap looking lock mechanism. The whole piece that attaches to the doorway looks cheap, and has only one setting to lock. Once locked you can still move the arms with your hands even though you shouldn't be able to. After doing numerous weight tests and seeing my son play in it, I am confident that it will not fall down. Now, five months later my son bounces in his 'car' for hours at a time and he LOVES it. I feel safe putting him in it and leaving to put in load of laundry or take something out of the oven. My son is a very active bouncer and has really given his car a run for its money. The money we spent on the car is well worth my sons squeals of delight as he is bouncing to his hearts content.

In addition to a deceivingly unsafe hold there are a few drawbacks which I feel I need to touch on:

There are two buttons the baby can press which make the lights flash and music play, however when a baby is in the bouncer their arms rest in the same spot where those buttons are which make both go off simultaneously and repeatedly which becomes more than a little annoying for you and very confusing for your little one. My advice: don't put the batteries in. The designers weren't using their heads when they decided to put those buttons there. There are still some soft star teethers on the front of the car which can occupy the baby's attention if they aren't into jumping just yet.

The other thing I really don't like about the jumper is that there are three lines suspending the car in the air, then a divider and then one main line up to the lock at the door jam. The divider is pretty low down, just about 6-10 inches above the baby's head and it makes it very difficult to put baby in and take them out of the device without hitting their head on the divider.

There are some good points too:

The seat is a kind of faux leather which makes it great for quick clean ups and you don't have to worry about staining.

It has an adjustable strap which is very easy to change so that you can adjust the car for the height of your growing baby.

Lets face it... It looks cool!

I don't know if I would buy it again given the chance, but I wouldn't give it up now cause my son really seems to love it, and I trust its safety.

Not so sure- is it even safe?
I just started using this and am worried about its safety. We have high ceilings and modern, metal molding around our doorway. The latch that affixes this contraption to the doorway only has one setting to tighten it. I worried it was not locked tight enough. Yesterday I was lifting my son out of it and the latch un-clipped itself, falling to the ground and coming inches from hitting his head. I don't know if this is because my doorway is not standard so will not condemn it totally. It does look really cool, but for the extra money (beyond the standard Fisher Price models) I'd expect to get not just a cooler product, but a safer one too. I am going to call Combi and ask them to take this back. I'd also purchased a vibrating Combi bouncer that we gave away because the baby hated it. After buying two Combi products I am done with them.