I am comparing an openline Boosteven R281 4G+ / LTEA router with my TPLink MR150 4G / LTE router and my CPE VN007+ 5G / 4G+ / LTEA router.
All speed tests were conducted on the Smart network with the same SIM card and placing the routers in the exact same location.
Please note: The Boosteven R281 does indeed make use of carrier aggregation (4G+ / LTEA). However, the external antennas that were supplied by the vendor were not recognized by the device, so it was running on its internal antennas.