What is good for the LIDL UMAP 12000 D4 start-up aid, or: Experiences and suggestions desired

Moin Leute, in the current LIDL-Prospekt über diese Starthilfe mit Powerbankfunktion und Licht stumbled:https://www.lidl.de/…/p10022541 Priced yes interesting, but is it also good? As it looks like you can start gasoline up to 3l cylinder capacity and diesel up to 2l cylinder capacity, which is not sooo dolle, but for most cases probably enough. Of course you can not do any minute-long organ sessions with it, but probably the capacity and the cable cross section is not enough. n n come statements like “very useful” to “does nothing” (tlw of the C3 which is identical). As comparison device I got stuck at Topdon with the devices JS or VS 1200, which as the name suggests have a peak start power of 1200A, which is more than twice as much as with the UMAP with (only) 500A. I have no real requirements, would only be helpful/useful/settling for emergencies to have something like that in the car, is also enough a simple start help cable. chen functions are also quite nice and not always you can reach the other car directly with the donor car, e.g. in garages or narrow places and 12V you can also use sometimes in mobile.