If you are looking for a 30rd loader then you will have to build your own
Maglula... accept no substitute!
Maglula is universally good IMO. I have used several other Lula loaders (AR, AK, Uzi, AUG to name a few) and they're all good.
The B&T is amazing. Magazine Loaders for B&T MP9 and HK MP5.
I'm going to give the nod to ETS C.A.M. loader. The package says Universal speed loader for rifles and calls out for the MP5. After using one for a while now not sure if it can get any easier short of someone else doing the loading for you.
Thank you for the responses. I took a few of my SBR's out this week and by the time I got done loading uzi, mp5 and AR9 mags, my thumbs were dead.