I’ve had no trouble with the values of my eBay resistors (I haven’t systematically tested, but the ones I’ve measured at random have all been in spec.), but I wouldn’t buy them again, just because the leads are so aggravatingly thin, as others have said. They’re grudgingly tolerable for soldered projects, but no good at all for breadboarding. And of course the fact that the assortment I bought meets it’s spec is no predictor of whether other ones will.
Given how cheap decent quality ones are on Digi-Key, mouser, etc., I’d just buy an assortment there. (Up to you whether to buy an actual assortment kit or to just order some a la carte. But for what it’s worth, if I had it to do over again, I would splurge on an assortment kit that comes in a proper quality set of drawers. The time it saves over organizing them yourself is worth it.)
(I actually now mostly buy resistors at the local mom-and-pop shop, since if you count and cut them yourself, they even give you the quantity discount on mixed values! If I buy 100 resistors at once, it’s down to something like 5 cents a piece, which I think is fine for mixed-value name-brand product.)