I for one have never spent my money on them.
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I just bought the all parts pack for Armored Core Verdict Day. I'm pretty happy with decision. One Verdict Day was on sale for 7 bucks and the parts pack was 5. It unlocks 194 items and I'm just starting out. For me this wasn't about an edge in multiplayer. I'm clawing through the story mode and I have more fun in the Workshop just fine tuning mechs to deal with each increasingly brutal mission. So it saved me a lot of time and I can still enjoy the game while not getting overly frustrated by lack of diversity because I can't kill the indestructible hopping AC who can't shut up in cut scene.