:/ my lachesis doesn't lean
i can't stand having my palm arched around. much more precision and much less wrist strain controlling the mouse with the finger grip, rather than palm grip.
it's all up to peronal opinion though. I'm blatantly right handed. So bad it's kind of sad really. left arm is practically useless. but even then I can't stand right handed mice.
and the g15 does have macro keys on the left, just not as many. only 6.
but there are also 3 mode buttons, so with the push of 1 button you can switch between 3 presets. so i guess you can say it still has the funtionality of 18 buttons, if you want to practice the on the fly swapping.