Well, I got the BST-1 in 3 days after ordering. Two words - Pretty nice.
You'd never know you have shortwave in the car, other than the 24" whip on the trunk. Nothing in the front seat at all. I keep the Key Fob controller in my ashtray since my car is electronic start, no real key hanging from the dash. To listen to shortwave, I just tune to 88.5 on my FM radio.
I'm using in a 2012 Infinity G-37. Put radio in the trunk and antenna on trunk lid. Took about 10 minutes to put on antenna. It came on 88.5 FM and that was good clear frequency for my area, so didn't have to change it but I've experimented with changing freq with the key fob and it is easy. It's in a nice solid extruded aluminum box. The power cord is long, about 10 feet and was ok to get from my front seat power outlet through the flip down opening to my trunk. I bought their antenna and it is some stainless steel trunk clip type with a 24" long whip. The cable is about 6 or 7 feet and plugs right into the BST-1.
It was on 15 MHz when I turned it on. I heard WWV here in GA in middle of day. S meter read S6. Lots of stations when going through the presets. The RDS readout is nice, you get the HF frequency and preset number when you change channels and then after a few seconds the preset number changes to the S meter reading from 1 to probably 9. I've not seen anything bigger than 8 and that came from 7315 WHRI in the afternoon. The AGC seems good, no real difference in audio levels between S1 and stronger signals.
Audio is very nice, about same volume as any FM station and if you set the bandwidth to music, it really opens up. The oldies show on WTWW on 5085 at night really sounds good. Fidelity better than the AM radio in the Infinity. Seems to have good low frequency audio response as I can hear the 100 Hz time code buzz on WWV when signals are strong.
I can listen to The Power Hour during the 8-9 AM time as I drive to work. This is 7490 from WWCR. Very decent signal. It is shortwave, some fades and noise here and there but very impressive while driving.
Haven't had any car noise that I can tell but I haven't done extensive tuning around. I think the antenna way in the back helps plus it get grounded by the set screws on the clip mount that punch through the paint to the metal.
Seems very sensitive and selectivity is OK. At night I can hear Overcomer on 5015 from WRMI at about S3 against Cuba music on 5025 that gets up to S6. Seems to separate them OK but you can hear some splatter from the Cuba station. I think that is the Cuba transmitter not the radio but need to compare with my Kaito.
At night, it is really nice while driving, lots of stations from Europe. 3885 Ham AM Calling frequency has lots of activity. 9420 Voice of Greece very good signal with music. You can see the fades from the S meter moving around but audio stays pretty level. Also it has some CB channels in preset, #6 is CB Channel 6, the one with the high power Dx'ers and I was listening to some locals.
Once you figure out how to tune it manually, you can tune any station you want that isn't in the preset as it comes from factory. Adding new frequencies to the preset is easy. Once you find a new frequency you want, you hold the top button down for 4 beeps and then you get some kind of Morse code message and the display will show a new preset number for that frequency.
My car switches the power to the power outlet so it always starts up when turning on engine. I can see some type of SW version info that shows at power up. Everything important is saved in memory when you power down, so it will start back up on same frequency and audio bandwidth, FM transmit frequency, etc.
When you are scanning in preset, you can hear a bit of background noise at it tunes so you can tell it is doing something, but it isn't annoying. I took the antenna off and ran the scan and it took 20 seconds to go through all of the 50 channels or so that are in the preset as it came from factory. I notice that it will stop on very weak but just listenable signals and they always read S1. If you are listening to something and it goes off the air, the S meter reads S- and in about 3 seconds the radio will completely mute the audio.
I need to run some sensitivity comparisons between the BST-1 and my Kaito KA1103. Going to use batteries in the Kaito and and hold it outside car, up near roof and do A/B comparison on what I can hear on each one. More info to follow after I use it some more.