I bought a bump king from 5stardeals and it didn't arrive. They sent a second, that also didn't arrive, so I hadn't gotten back to them. They were really nice guys and very eager to help out, and they have excellent feedback so I imagine it's just bad luck, and I'm getting in touch with them again, though I'm a little nervous because it doesn't exactly look great on my end to them, I'd imagine.
Of their beyblades, only the semi flat base of knight dranzer/master driger is useful and there are better beys with it, roller defenser has some historical interest for the goofy mod that was going to be banned but then everyone cbf'd on it, and bump king is somewhat valued for being Bump King. I actually considered buying the case of 12 they offered for tournament lols and then reselling them to make back most of the money, but with the fragility I doubt I'd have many left. That said, the Hasbro boxes are all very pretty (it's like the inverse of the packaging today).
Yeah, Spin Dragoon is really a collectors item, but given it's the first beyblade it's probably rather an important one. And of course, that bit chip sticker is amazing. I've got one mint spin dragoon with a mint sticker, and a second copy of the bit chip sticker that's rather damaged (basically, if you put nail polish on to protect it, be careful as metallic stickers ink comes off, though most of the damage was done by a previous owner somehow), but yeah.
But makendo and megaro arm are much less important/notable/valuable, you can still find nip takara ones on a few sites for cheap prices.