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Yep, got an M6 acorn nut and drilled a 1mm hole in it, works like a charm!
Can't comment on the Rocket, but I'm a big fan of the La Pavoni.
Apparently you can only get around 6-8 drinks out of it before it needs refilled with water, but that's more than enough for me (max I've put through in one sitting is a pair of flat whites, no issues with steam pressure falling off I'm happy to report). Plus it only takes around 10 minutes to warm up.
Hah!
My tuition is available for a not incredibly extortionate rate!
Honestly though they're not as tricky to work with as I expected. Only took a couple of shots to get a feel for the force to apply to the lever. It does throw in an extra variable when dialling in the grind which isn't the most user-friendly feature.
On the plus side, it's one of those things you can say you're definitely better than James Bond at...
https://www.youtube.com/watch?v=Y0XeO66xXAs