After restoring I put my A2 on the shelf as I wasnt interested in doing a lot of mods just to have another single xtal filter radio and I dont have enough BC-453's to go around.
OTOH, I do use an A3 that came with the AM and CW mechanical filters and made a few AGC and audio mods so thats its tolerable on AM.
The A4 is another story and Ive had that since 65, is loaded with mods and is my primary 80/160 CW DX digger and slaved with a TS-950SD which has upstaged a TS-940. The 950 RX is better than the 940 but the 2nd RX feature sucks so the A4 is used mostly for that. The 950 is also excellent on AM with a few tweaks and Ive been getting into a bad habit of using it a lot lately