Leverage seems worse in that situation than something like a deus ex, especially since the current hotness for R&D digging is interface and indexing, which don't go too far down.
LLDS may be good early on, but it has the dinosaurus problem of only being useful before your rig is full. It might see play if there is some crazy recursion engine later on, but currently, as an avid exile player, there isn't enough recursion.
I do agree that rex campaign is decent, costing 1 to flip makes it close enough to worthwhile that i'd try it in a wide HB setup, especially since ETF makes it functionally free. If I'm strapped for cash, trash cost 3 is just enough to make me not want to trash it.