Yes, agreed. A few of my friends experimented today - cheap mobile radio Vs cheap HT (on the same flowerpot antennas). The mobile rigs did better.
Tried the band pass filter today, up on G/SC-003. Whilst it attenuated my TX, it certainly made RX a lot clearer (despite the relatively low QRM today). I didn’t see RX changing much on the S meter whilst experimenting with my friends - they just sounded clearer, so making contacts was easier.
Pleased with the purchase, worth having it in my kit. It’ll certainly buy me a more time to search for a better HT. 