A few thoughts in a naval UAV.
1) the Transwing P4 has a payload of <7kg of cargo (future P5 has significantly more), whereas the S100 has 50kg of sensors. Not in the same class.
2) I figure that UAVs have a lifespan of less than 10 years. Over the majority of the next 10 years we will have a max of say 10 major surface combatants, 6 OPVs and 2 LHDs: 18 ships.
However, my understanding is that the ANZACs would struggle to accomodate an S100 in their hanger in addition to the Romeo.
If I recall correctly, there was quite the concern when the Seasprites got axed that the Anzac hangers would be too small for a Sea Hawk, so cant imagine theres a lot of spare space for an S100. If thats correct, then for the short term, at least, we only really have 11 ships capable of operatinh an S100 sized UAV. Then, assuming a couple are either in upgrade (Hobarts) or general maintenance, we probably only need 8 flights.
Not a big investment, to get a significant operational capability, and not a huge loss if it doesnt turn out to be quite what we need / want..
3) I remember reading at the time of the S100 cancelation, that there were concerns about whether security had been compromsed somehow by either (or both) the PRC and Russia. If this were a contributing factor, it would appear to have been dealt with, as there have been numerous orders by major NATO countries (amongst others) including France, the UK, Belgium and Greece.
4) Let's just buy a dozen mature, respected systems (S100) that we are very familiar with, and that at least one major ally uses, put it to sea, and stop pissing about.