I have had two of them over the years and they work extremely well. You can even use two of them side by side (son and I ) except for the fact that he who moves the mouse first gets priority.
The 2 AA's in the keyboard last for yonks but the mice eat the AAA's for brekky! Mind you I have not tried a set of super life "camera" types in them.
The battery covers are a bit feeble and I guess you get what you pay for but operationaly I cannot fault them.
Just thought. It is said that you should disable all wireless clobber in music PCs. Do these qualify and if so what about the Frontiers Tranzport?