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TRA
Dammit
Not for me, but with caveats:
I have one that is 18000mAh/66.6Wh, that promises a starting current of 500A, with a peak of 800A. It's a G09D by DBPower, it's advertised as being able to start "up to" a 6.5 litre engine.
I bought it because it promises to be able to start the Mercedes, which as a 5.4 litre V8.
However, whenever I've tried to use it the charge in the jump pack has dropped to ~60% and it's totally failed to turn the engine over. Each time I've then had to charge the battery conventionally, whilst also charging up the jump pack.
For food-processor type engines of less than 2 litres they may well be fine, but for larger stuff, in my experience, they're all promise and no performance.
EDIT - the same pack also failed to start my 911 (3.4 litre) or Matt's Boxster (3.2 litre).