The TL-WDR4900 is TP-Link's best router we've tested, and it's faster than both the WDR3600 and the WDR4300. The range of features available on the WDR4900 is also good, even if we do miss the guest network option. Other than that we are very positive about the TL-WDR4900, and can definitely recommend it.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips