I had been using for a couple of years a small 400 amp unit (same as the Power All). While it has had limitations, it has been a great unit & probably started about 400 vehicles. It was though past it's best & I was more often getting the battery & leads out.
I recently obtained a new unit (as in pic), it is way superior with about 4 times the output - this i have confirmed.
Be aware though, any jump pack sitting unused in the glovebox for 12 months will prove useless in trying to start the vehicle. I often use mine several times a day.
Jumper leads - discount the entry level ones, you will probably need to spend $60 -80 for a reasonable set