weird allocation of dpi switch buttons
I'm still bothered with razer's side buttons
inconvenient especially to large palm
sometimes run off little precision because accidentally click it while try to hold it firmly
as usual, handling & mouse feet design are prone to be on speed side, love it
if only razer can have those side buttons allocated somewhere else...
5.6k dpi...still a long way to tame it to me

this can happen sometimes if you try to change certain setting through razer's software panel
replug the usb end for few times and see if it is running
otherwise reboot your pc or reinstall the driver
lachesis is incompatible with exactmat (speed side), you might face cursor stuttering issue once in a while at mid-high dpi setting
no idea why is this occur, while other laser mouse using like G9 works fine on it
if the problem persists, maybe due to loosen cable or etc, just do RMA and get a new mouse

unlike draggy cloth mat, hard-plastic surface is slick and gives low friction feel
supposedly friction btween hard surface and mousefeet is less than friction btween cloth surface and mousefeet
how can the hard surface leads to quicker mousefeet wear in this case?

btw high sensitivity user can make a big jump with just a little shift
while low sensitivity user tends to move the mouse a lot
thus the mousefeet lifespan decrease as travelling distance increase

want to get the longest lifespan out of your mousefeet?
go for speed mat (hard plastic or metal based) and get use to high dpi setting

I wasn't advising, but responding to your perception as most people might have
mat of choice is depends on your usage
basically design work, strategy game focus more on control side, cloth mat can produce sufficient friction to provide better precision
while most of hard mats are slick, they enable swift movement which is handy for fps gamers, frag before fragged

why being considerate to the negligible matter such as mouse feet lifespan while pursuing for mous'ing performance?
what if the mouse dead before feet totally worn out? or the pad torn into bad state before the feet? or quit gaming anytime soon?
mouse feet replacement is cheap yet you can DIY with teflon tape
just get one you think that is affordable and suits you the best
most of the time getting expensive or higher end equipment doesn't mean one can gain the best result out of it
I've seen how good a western guy gaming performance is with just a MX518 on small piece of thick drawing paper
max out the dpi setting along with minor sensitivity increment done in game, his precision is almost flawless
there's no perfect match of mous'ing equipment, it's all up to how well you're adapted to your gears