i have found the peli cases a very reliable and practical professional upgrade from clunky flight cases, for traveling with gear by car or train, to safely transport e.g. a rack synth, mics, sound cards, etc.
i also have the peli case lid-organiser, which comes in handy for cables and plugs, though it goes in place of the foam protection in the lid, so this needs to be considered when packing
when planning to take this peli case on flights, one should know this size is not considered hand luggage (the smaller one is), and even though it is quite safe to send it into hold, it is considered 'odd sized baggage' (in my experience), so i have had to calculate some extra time in the airport for that.
just a small note: it would have been a nice service from peli to deliver some locks with the cases.