Thanks for the replies.
I guess I posted this because it's a very slick and lightweight rig, ideally suited to stealth recording. The sound to my ears seems perfectly acceptable. Cost wise, here in Australia, I got the Lavs for $210 aus each - compared to $500 each for 4060's. I'd been waiting patiently for used 4060's and just never came across any.
I've heard a few 4060/Line audio OM1 comparisons on gearslutz - I've done my own Om1/Rode Lav comparisons. Maybe I have cloth for eardrums but I think the differences are subtle, I did double blind tests and could always pick the differences but it wasn't always easy. I would love to do a well controlled 4060/Rode lav comp. The Rode lav definitely has much more self noise than the OM1 (the quoted spec being just 1db greater than the 4060) but in the context of PA recording I can't see that it makes any difference.
I think the bass in this recording is quite accurate to reality. How these little guys would fare in a more typically bass heavy gig is yet to be seen.
I e.mailed Rode yesterday asking if they could supply female micon connectors or if they had any other suggestions regarding making a low profile connection of a pair of lavs to the 3.5mm mini. This morning I got a reply offering to send me two micon cables free of charge for me to re-terminate myself!
Oh yeah, this is clearly not a setup for superloud gigs! That's not my thing anyway so I'm cool with that.