Heated Grips?

Looking to get some but there are so many out there… so which one to get and are they worth it?

I was thinking combining the grips with handguards to stop the wind hitting my fingers like this one:

Grip wise… God knows as there are quiet a few brands, from oxford to R&G but was looking at these:

And the jacket heater looks good also:

All together would be around £100 which is as much as some heated gloves.