overall it was a horrible mouse. It did not stay connected and whenever ...
579993
Giving 2 stars for just for the fact of how it felt in my hand, it was very pleasant. However, overall it was a horrible mouse. It did not stay connected and whenever it was suppose to reconnect it wouldn't and I would be forced to disconnect and reconnect. It became more than a hassle just to use a mouse.

I did all the tips and tricks I could find through other reviews and online and still nothing worked. I don't know if I managed to get a partially disfunctional mouse, but this is how i'm reviewing it.
2231352
I returned this a couple of days after it arrived. The mouse was awful but I might have tried to get used to it. The -------- key would stick on intermittently, often. Called HP and they said it was something they would need me to send in for repair. I just returned it instead.
2129444
I hate to say it but this mouse barely worked. It went in and out of connection. I don't care how cute it is, it's a total pain! I just want something that works.
600368
I bought this mouse and tried to get it to work for 2 weeks, then finally had to return it. I also purchased the Razer official Exactmat mousepad to make sure there were no issues with the surface area.

The Lachesis mouse has known issues on the Razer website. I went there looking for a fix. Razer has a "beta" patch for the mouse skip issues but you have to install the patch "at your own risk."

Customer support is only by email and not very good or friendly or even quick. There is no phone number to call them.

I updated all the software and it was still buggy.  Sometimes it worked, sometimes it skipped, sometimes it just completely stopped working.

Ergonomics : not good

I went out to the web and now see that this mouse has bad reviews on other websites most notably because of the bad ergonomics.
The Shape of the mouse makes it uncomfortable after just a short time using it for regular functions or games.
4332502
I tried this one since I want something better than a 4 foot wireless mouse but like the 3 or 4 I've tried before there is something about bluetooth that is no good for a mouse. It is slow to respond each time you haven't used it for a few seconds, then it also periodically with no pattern, just stops working and have to get it to reconnect.
4402035
This mouse constantly cuts in and out, and the only way to get it to work again is to turn it off and back on and wait for it to connect.  This happens consistently about every 15 minutes, and it's very annoying.
2848410
Avoid this one like the plague.

The mouse itself is significantly smaller than other travel mice Ive used from Logitech and Microsoft; so much so that my hand starts cramping within a short time of use.

The Bluetooth is glitchy when it does connect, and on my older HP it would not even connect at all.

The USB dongle for it pulled apart completely the first time that I removed it from a system (as I was testing it on different ones). Finally got it back together enough to use but it is clearly not securely made and now I am wary of it coming apart again. Contacting Razer for a replacement proved fruitless.

The battery cover being integrated with the buttons also concerns me, as the plastic appears rather flimsy.

Overall? Avoid it like the plague and stick to companies that stand behind their products
2034687
I would not give it a star if I had a choice. I paid $13.95 for this trash worthy mouse. I should just have bought more of the the Logitech mouse that I also got from Amazon. For $0.30 more I could have a better working mouse by Logitech than this piece of trash. I thought it was just sucking up all the power from my batteries. I keep changing batteries and even upgraded to a more powerful and expensive batteries because this mouse will just stop working. It's not the batteries!  Its the mouse that would not work properly!
125427
I've owned my share of wireless mice from different manufacturers (logitech, microsoft, etc.) and used them on my desk successfully.  This one just didn't work.  The lag was terrible; the pointer was very choppy.  I tried putting the receiver into different USB ports, adjusting the pointer settings, changing the battery, but all to no avail.  I am returning it.
2624854
I am a loyal Logitech customer.  I have had mice, keyboards, and speakers by logitech in the past.  For the $70+ price, this mouse did not deliver.

The main issue for me was connectivity issues between the mouse and the receiver.  I had a wireless Logitech keyboard connected to the same USB 6in1 unifying receiver as the performance mouse MX (I have limited USB ports and bought the mouse for this reason).  I never had lag issues with my keyboard until I paired the two.  I would type a sentence and it would start a second after I started typing.  This got confusing.

The mouse itself would lag when moving or sometimes cut out all together and I would have to turn it off and on.  I had all the latest drivers and a full charge.  I think it was a noise issue with the receiver.

I sent it back for a full refund, going to try another Logitech mouse.
1445042
It totally crapped out. At first the little plastic casing around the USB plug that actually plugs into a USB port onto my laptop came off. Cheap plastic, whatever. It still worked. Then it totally stopped working. Printer went offline, caused me to panic in a major way. Mouse wasn't working. It's a bad product. Save your money for something better.
3914045
Disconnects frequently!  I've changed the batteries several times.  It does not always reconnect, which interrupts my work.  I do not recommend this mouse at any price.
3669930
I honestly cannot recommend this mouse less. It stopped working for me after about a month and is just a pain to use. Its also somewhat painful on the wrist to use and this is the key - it stops registering on your computer and does not work.
2880947
what a s***ty mouse. first hour using it the auxiliary mouse button 5 got stuck and wasn't able to stop it from working. had to go back to my old broken mouse. BULLS***!
4197111
I had to keep it hooked up to the charger all of the time, because it would very quickly lose its charge, so having a cordless mouse was pointless.  What was even worse though was the mouse did not work very well.  I was constantly having to click the clicker and it had trouble finding the arrow and controlling the arrow on where to go on the screen.  I finally gave up - the mouse is no longer being used and I've chalked it up to a bad buy.
2598778
DID NOT WORK FOR EVEN 1 FULL DAY.

MOUSE WOULD NOT STAY CONNECTED THEN FINALLY JUST QUIT CONNECTING ALL TOGETHER.
537069
This was a replacement for the first one, which did not work. "Disconnects" repeatedly so all devices using the hub also disconnect repeatedly. Since I keep the wireless mouse USB transmitter in the hub, the mouse works sporadically. Just replaced with the Anker USB hub and the problem disappeared. DO NOT BUY. Not worth the hassle.