Dunno about the other comments about the MX6021,
But I bought it for my office and it sounds really awesome..
dont have any fake or plastic sound. It looks nice and big too which matches and fits my 6 feet table.
Just the damn short cables. Its only good for desks!

Maybe you all didnt adjust the bass and treble properly or you guys using the MX6021 very loud.
Thats why you get some bad bass or not good quality.
But bass cannot fight the Edifier R501 at all.. R501 for bass is just too awesome!
I dont like the bass of the Z623 doesnt sound nice to me at all.
MX6021 is not a thub thumping bassy unit. Its more for nice gentle music

Sengkin95, if you like listening to music more and medium general gaming like i do the MX6021 will fit your description. But if you are a hardcore gamer just go for something with more bassy other brands.
If you are watching movies more then go for Logitech THX speakers they would perform better. MX6021 is more of an all rounder it doesnt sound as good as my Soundsticks III but it does pack more bass and makes MP3 sound more crispier. Playing music on youtube sounds lovely too.

I brought a few clients over to my office and after they heard the quality of the MX6021 they told me that was the best PC sound they ever heard up to date. Of course i was playing with some Jazz music and some 80s pop hits.
They were very impressed with the Sound Aura being able to generate in front of the notebook and rather from the speakers.

Volume knob and all my items are all working fine. No loose or spoilt functions till today. It took a day to get use to the crappy control.. but after you understand it, you will hardly use it.. you only need to OFF and ON when you adjusted all things carefully.

Not being biase, but I did test the Z623 speakers they look quite ugly and not really good looking... yes they have THX but you are bound to find a better looking set next time after you buy this.. as for me I like something that looks good and of course must sound good with my Jazz music to last me for years.. I dont like going to shops every now and then and looking for better and better speakers.

Just my thoughts. Its your decision.

no problem glad to help out a fellow lowyat friend.
go test nicely and get the best sound staging which suites your preference.
but remember in All IT the hall is bigger so if the sound sounds good there
when you go home the sound will be even better, if your PC is in the room.

Cheers!