I've had quality issues with some of their previous keyboard mouse combos, particularly bluetooth mice and perishing rubber. However currently I use a M325 wir

I've had quality issues with some of their previous keyboard mouse combos, particularly bluetooth mice and perishing rubber. However currently I use a M325 wireless mouse and its very tough. Carry it in my dusty laptop bag, dropped it a few times - no problems at all. No issues with rubber degradation. Highly recommended and works with unifying receivers.