Originally Posted by GTcommuter
I've always found them to be inconvenient. I'm used to bar-end shifters and it's tough for me to move my hands in to the center for shifting. If you buy the bike, you can potentially move them to the downtube or Rivendell makes nubs to convert them into bar end shifters. I like shifters in roughly this order: bar-end, thumbies, STI, downtube, stem, twist-grips.
My shifter ordering would be similar to yours, except I really like the GOOD twist-grips like SRAM Attack (as opposed to the junky ones on most low-end MTBs).