I think the 9100 is a better performer also, and bought one (new) recently. I've never owned a TS-2000 so I cannot put them side-by-side but always noticed that on VHF-UHF literally every single time I worked anyone with a TS-2000 they never heard me as well as I heard them, running exactly the same power; I suspect high NF or if not that, possibly just high phase noise that masks a lot of stuff. Starting when the 9100 came out, I noted everyone using one heard me just as well as I heard them, running equivalent power; this "experiment" was repeated probably fifty times. My main VHF-UHF rig for years has been an FT-736R which is pretty "hot." When I got the 9100 I did compare it to my 736R and it's about the same. I don't have 23cm in the 9100 but it doesn't look difficult to add. I do have it in the 736R, and as someone stated above, it takes more time to remove the covers than it takes to install the module. The only thing "difficult" at all about adding modules to the 736R was making sure the thermally conductive sil-pad is exactly lined up when tightening down the screws, to assure good heat sinking. That takes about an extra minute, but the "module installation" from start to finish takes about 15-20 minutes. I don't think it will be much different with the 9100 if I ever add that. The 9100 has the advantage over the 736R in that it's 100W on 50 and 144 MHz, and 70W on 70cm. On SSB-CW it runs cool; on FM if you hold long transmissions, it runs hot! I don't work much FM so I don't care much.