For ten dollars, if you have some kind of use for them, IMO they are worth it. Like Gordon above, while selling audio gear in the early 90s I've heard Pioneers in this series and surprisingly they sound pretty decent, definitely better than they look.
I think this happens because Pioneer builds all their own drivers and can put togther a speaker system where one driver's deficiency can be made up for by another driver; and/or using some intelligent crossover choices can mask certain driver & cabinet problems.*
As weird as it seems, it requires really good engineering skills to build a decent-sounding cheap speaker (and Pioneer, being the huge corporation it is, has the deep pockets to enable this to happen) vs. an expensive one where you can use any material or manufacturing method you want. One mark of a good cheap speaker is that it produces few *irritating* sound qualities. Because at the lower price levels, an engineer has to pick & choose what he wants to include in a speaker system (great bass OR awesome mids OR heavily built cabinet, and so forth) so while such a speaker won't have super great detail resolution etc, at least it doesn't bother you when you listen to it.
* even if that xover only consists of one cap each for the tweeter and midrange and maybe an inductor for the woofer....which brings up another issue: if the drivers are being designed from scratch to operate together, then for example each driver can be designed so it has a built-in natural cut-off frequency slope that helps it more smoothly blend in with the other drivers it is working with. This way a less elaborate crossover can then be used....or none at all in the case of a woofer. This is much easier to do when the company that builds the speaker system also builds the drivers that will be used in that same system.