I have a three Anovos Proton Packs which are actually pretty nice, but... you can upgrade parts and pieces. They came without lights and sound, so my first upgrade was adding lights. I did wire the switches to the proton wand. When the Hasbro wands came out, I took two wands and switched them, just to have a cheap way of adding sound.
I noticed the question above, about replacing the wand from a Spirit pack to the Hasbro one. Because I did wire my lights originally and did not want to even try wiring them to the Hasbro wands, instead I wired the packs light switch to a simple on off toggle switch. So for those wanting to upgrade the Spirit packs, I would isolate the two wires and just run an external switch for those and use the Hasbro wand.
The biggest visual issue I have seen with the Habro wand is the terrible Clippard replica valves. So, I decided to upgrade them with real Clippards. The first wand I worked on, I drilled out the plastic screw caps and took apart the entire wand. I had to do so to reach the upper chamber that holds the screw nuts on inside the housing. I then used a Dremel to cut out a center hole for the real Clippard mounting base and two more larger holes to thread the real Clippard screws in. IT WAS A LOT OF WORK. To note, I have 4 Hasbro wands, and I did not want to do that again on all four wands. I had to take pictures as disassembled everything and then carefully assemble everything back, about a 3 to 4 hour job for the one wand.
For the next three wands, I unscrewed the Hasbro Clippards out, Dremmeled a holed for the real Clippard and then carefully drill to holes that I could then real Clippard screws in. Half hour of work, much easier.
I am on somewhat of a budget, so if there was any change I would make first, it would be this modification.
The rest of the metal knobs can easily be accessed on the interior bottom level of the wands, still some work to drill out the plastic caps but very easy from there to pull out the panels they are mounted on and replace them with machined knobs. I actually though Hasbro did a super job on them so it's the last thing I plan on modding out as I want to add in real parts to my packs first. But as you can see, it makesa huge difference in looks and even feel with the Hasbro wands.