I'm an angel set user myself. I wear it all the time, weather i'm soloing or in a crew. The thing i've found (and even more so since hunters bow got fixed by Q) is that all the rings in it are useful.
You've got healing halo which is good precombat readyness and at high levels even when standing is the equivelant of bandaging everyone around you. Also fantastically useful for the gauntlet as it heals you whilst you run. Wish, which is a FANTASTIC crew healing spell (seriously godly as far as healing goes because of it's quick as lightning cool down and high healing), can be useless whilst your alone but even then if you run into someone else who's soloing in the same area you can allways heal them. Divinity needs no words. ;D And hunters bow allthough it wasn't verry good before the update has suddenly become much better. Not only can you use it to attract single or pairs of enemies away from the pack when soloing but now it also slows movement to almost half which i've found REALLY useful in the short time since the upgrade if you or your crew needs time to heal. <3
And the luck bonus whilst not as large as that given by your ghi ability is verry useful because it doesn't rely on your ghi and when your in a crew with multiple sets the drop rate increases exponentially.
When soloing it's my angel set plus Solar Ray, Slash, Diagnose and Fitness. Or i can go completely support caster and swap out my solar ray and slash for defibrillate and teflon spray.
So yeah, high praise for all the angels out there. ;D