Depends on the kit and more importantly the Frequency. The gains >DDR3-1600 are fractional at best and the cost-to-performance is VERY poor.
Example a G.SKILL Trident X Series F3-2800C11D-8GTXD is simply good for adding a 'hair' on a benchmark, BUT these kits will kick you in the head and require stupid voltages to remain stable.
Example a Corsair Dominator Platinum CMD8GX3M2A1600C8 is all about looks and the LEDs, the RAM IC's are perfectly fine and will cause no issues.
My sincere comment and advice is to make good RAM choices and if you're looking to improve performance then make ultra-fast RAM the last option after the best CPU, GPU(s), SSD, MOBO, Water ... etc.