I've had my SL-6000L for about 9 months now. I'm still running the stock Sharp ROM, stock kernel. I also have the expansion sled, and a Socket CF Bluetooth adapter (Rev. G). I purchased it used from eBay (though from the condition it arrived in it hardly appeared used at all). It replaced my battery-murdering Palm VIIx as my primary handheld.
Things I love about it compared to other Zaurii:
* Portrait orientation enables one-handed operation of things like e-book readers, so I can sip a tasty beverage with the other hand while I read.
* USB host controller makes using USB flash storage drives and USB external keyboards easy.
* Built-in WiFi used frequently.
* Fits nicely in my eHolster
, though it makes me look like a bigger dork.
* Groovy expansion sled doubles the battery life, the serial ports, and the CF capacity, and still (barely) fits in my eHolster.
Things that irritate me about it:
* Unwatchably slow video playback at all bitrates and resolutions.
* Lag in support of Zaurus open-source developer community and in accessory market compared to clamshell models.
* Screen cover is annoying to deal with and scratches too easily to be useful - it might as well be opaque.
* No integrated Bluetooth (the 6000W was impossible to find in the US when I bought my L).
* Built-in WiFi seems to have shorter range than my friend's C860 with the Socket low-power CF card (i.e., he can get signal in places I can't).
* Stock Sharp kernel doesn't support the version of BlueZ that supports the Bluetooth A2DP profile (it requires kernel > 2.6), so none of those nifty Bluetooth stereo audio headphones will work.
* Lack of Java applet support from Sharp/Opera for the Zaurus version of the browser.
I like my 6k and have no plans to get rid of it. However, if I were making a fresh buying decision today, I would save up and get a C3100 instead, mainly due to the lag in developer support for the 6000 and the larger flash size of the C3100 (plus the built-in drive). I don't feel confident enough with a soldering iron to attempt to do any hardware hacks on this expensive a piece of gear.
This thread is the first I heard about Cacko6000 - I may look into switching to that to see if it helps my video problem. I may also try out pdaXrom and OZ one of these days.