For a while I hated my Motorola Defy. T-Mobile was really behind on releasing Android updates, and all the bloatware really slowed it down. Finally, CyanogenMod 7 came out with Defy support, and I was amazed by how snappy it was, and how much longer my battery lasted. My girlfriend's jealous of how awesome my phone is compared to hers, even though the hardware is identical and we're on the same plan.