Fast wired/ routing performance, but challenging wlan drivers - with zero hope for future improvements.
Depending on your environment it might work well, but if you have esp8266 based (IoT-) devices or have any intention to use 802.11w, WPA3 or other broken features, you'll most likely be out of luck.
The WRT1900AC v1 uses a much older (less common) mvebu chipset (without NEON support), unless it's very cheap I wouldn't look there. For new devices (full price), the price delta is small enough to go with the WRT3200ACM/ WRT32X instead of the WRT1900AC or WRT1900ACS; at their normal retail prices, only the WRT1200AC would be cheap enough to justify its continued existence (the WLAN issues are the same for all of them).