I'm with SteveD.
I have and use, and are very good at what they are, TT Zega-Pro's. They aren't as heavy as the MM's, not by a long way! they are nicely shaped for sitting on and bash back into shape really well after a fall. And after numerous falls, and some that deformed the cases, they are still water tight.
For security, in terms of basic security, hard boxes are the way to go, but after having hard boxes for a number of years I would tend to look towards soft luggage now, but with the frames of the hard luggage to keep them in better shape. The TT frames, athough expensive are very good as crash bars and for lifting a fallen bike.
Horses for courses really, sometime you need it hard, other times it's better soft - a metaphor for life!
In terms of soft luggage, I have and use the Kriega USx stuff. It is very good indeed as anyone who has used Kriega will attest to. But I do like the look of the Wolfman stuff too.
I also have some HG Oxford copies, they are OK and do the job fine as long as you take precautions and bag everything to keep it dry, the 'waterproof covers' ,,aren't !
I used the Yamaha OE ones for an extended trip, and they performed very well, a bit small and you need to be particular with the locks (keep them clean, treat with respect etc), and these do crash well considering the mountings are in odd places and there is no rear stabiliser bar.
Luggage is one of the most emotive subjects in motorcycle forums for some reason, but to be fair, it's down to everyone's own needs, wants and opinions.