Is J2ME good enough for development?

Recently our team are planing to research security and enforcement of mobile code, we are following the R's MCC.
And now I am facing a problem of finding a mobile platform. I decide to use J2ME. As J2ME is still used widely. Such as

nokia

3410
3510i
3585
3590
6310i
6650
3650
7650
9210
9210i
9290
siemens

SL55
M55
S55
S57
C55 / C(T)56
2128
M(T)50 / M46
3118
SL45i
6688i
motorola

v720
v720i
388
388c
830
6288
Of cause, there are other reasons but for the security I can't refer them. But after the item about 1 year latter, I will plaster the technique on my blog.