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Parts kits are drying up, so yes, worth it.
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If you want one, yes.
They'll only be (significantly) more expensive in the future so if you'll
ever want one, the time to buy is right now.
I didn't go for one, personally. HK33/53 scratches that RDB 5.56 itch for me, and I have the G36 (its replacement in Spanish service) so I'm good with those.
I think the G36 is overall better, and was fortunate to grab one while they were still cheap on the secondary market.