This one is a lap steel slide, a Gretsch G9220 Bobtail Round-Neck Resonator to be precise. It's a good guitar, well made, sweet tone, as metallic as you'd expect but there's enough wood in the sound as well. It projects well, is  comfortable and responsive to play. It records well. I haven't used the internal pickup much but it seems adequate. I don't know how it compares to the very expensive models but I can't imagine they's be much better than this Gretsch. You can hear it on my acoustic albums Honeyfield Road and Broken Landscapes over on Bandcamp. 

​One day I'll buy a Weissenborn because there's no imitating the sound of that wonderful instrument.

This is the Gretsch 9221 Bobtail, a straight up resonator, all metal. It plays as well as the 9220, reliable and a clean sound. I bought this used and had to take off the front to make some adjustments to the resonator. To get the steel sound you need to play a little more towards the bridge. Internal pickup - seems fine. It's a good one for trying out different tunings, free improvisation or straight up Appalachian tune-making. I play some tunes on my acoustic albums as well as on Outside, my album of free improvisations for acoustic guitars, again on Bandcamp.