Given MicroEmu and Opera Mini 4.2 on OpenJDK a good test this weekend using only a 2G connection. The experience is comparable to MicroB if you leave the screen effects enabled and navigate as you usually would. Though the zooming features aren't there it does come in handy when WiFi and 3G are not available.. Only thing about it is the font used by MicroEmu, I'd like to try and change it but I don't know where to edit this.

I did try using Opera Mini 5 beta, but this ran more sluggish..
Next test is to use J2SE as the Java base and see if it makes any difference.

In the main this would run better if J2ME was supported natively or through PhoneME, but this is the best work around so far.
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Back on topic it looks like OpenJDK is running fine. Assuming that Nokia won't provide native Java support at a later date, this should be made available as an install from the repository.