Cajóns we do not like.

Forgive the negativity, but I cringe every time I read the question on the internet "what cajon should I buy?" and see the reply "get a Meinl Headliner or an LP Aspire at Guitar Center." In my opinion, those are two of the worst sounding wastes of money in the percussion world. There are dozens of great cajons out there, but here are half a dozen I think you should avoid:

1) Meinl Headliner
Meinl's premium cajóns are good, but their entry level Headliner series is garbage. They sound like moving boxes, not musical instruments.

2) LP Aspire
Just like Meinl, Latin Percussion (LP) sells terrible entry level cajóns. The only difference is LP labels theirs the Aspire series.

3) Schalloch
As if Meinl's headliner series wasn't bad enough, Meinl has a subsidiary, Schalloch, which sells even cheaper, junkier cajóns. You can do better; avoid these.

4) Newl
Newl makes cheap cajóns with dual panels and sells them primarily through Ebay. They sound bad, but their biggest problem is the two panel design which places the bass zone so low that a player risks a serious back injury if he plays one of these for an extended period.

5) Echoslap
You probably won't find Echoslap cajóns outside of Thailand. The main reason to avoid them is they steal other manufacturer's designs and knock out clones without obtaining rights or giving credit to the legitimate designers.

6) Tycoon Acrylic Cajóns
Tycoon's acrylic models aren't inexpensive, and they sound pretty good when new, but they break frequently and easily. In short order, temperature changes, normal playing, and sitting on these cajóns takes a toll and the glued seams start to split, separate or crack. If you want a plastic (actually fiberglas) cajón, check out the Pearl Boom Box series; they're cheaper than Tycoon, better made, better designed and better sounding.

Tycoon Acrylic Cajón in its typical state

(note the completely smashed in back panel).

Again, these are JUST MY OPINIONS. If you love one of the above cajóns, I'm happy for you.