As OME struts are longer than stock, are you going to use spacers with those springs? If not, I'd expect your ride height would no be matched to the struts.
I put the Old Man Emu struts in today - the OEM struts P/n #41601-65D10 & 41602-65D10 (they are made by KYB just in case anyone is curious) have a compressed length of 325mm and an extended length of 480mm - the OME N103S struts have a compressed length of 340mm and an extended length of 515mm.
In theory I lost 15mm of compression and picked up 35mm of droop - I don't think I need to worry about the struts bottoming with the original springs.
The rear shocks were done one afternoon during the week when the workload was "light" - I have the compressed & extended measurements for those in a notebook that has gone walkabout (hopefully temporarily), as soon as I find it I'll post those details - the rear shocks that came out were not OEM but Monroe Adventure Series D7644, supposedly a premium 4x4 shock - compared to the OME, they look puny.
I did go for a quick test drive, nothing off road, but I did pick one of the worst roads in the city - the improvement is noticeable, but I don't think it's anything more than can/should be expected when replacing dead or dying shocks with new ones, I'll provide more feedback as time passes.
Edit
I found my notes - the OME rear shocks have an extended length of 500mm & compressed length of 335mm - the Monroes that were removed are 460mm extended & 335 compressed so that's 35mm longer, enough to make a difference if the rear is loaded.
The ride is much nicer with signficantly less body roll in turns - almost sports car like.