No issues with the antennas, it's mostly plastic and for show, so they're not as heavy as they look, but yeah, they're chunky.
I only got the GT-AX6000 as it was on sale and was a lot cheaper locally compared to the AX88U Pro.
Couple of reviews if you're interested
Underneath the eye-catching layer of gaming-enhancing features, the Asus ROG Rapture GT-AX6000 remains one the best dual-band WiFi 6 router that the manufacturer has developed so far, and it has held that status for about two years before Asus decided to release the RT-AX88U Pro. And one of the...
luumina.com
The ASUS RT-AX88U Pro offers two multi-Gigabit ports, a more powerful processor than its predecessor and it supports both AiMesh and some of the gaming features which are usually reserved for the ROG series (such as WTFast). That sounds uncomfortably close to the GT-AX6000 and the teardown does...
luumina.com