Z-wave automation is available with the Impassa. It is not quite as easy as the Qolsys IQ Panel 2+, but you would have access to Z-wave automation.
Qolsys manufactures IQ Panel 2+ with different legacy sensor radios to support different circumstances. One supports 433 mhz DSC sensors, and all IQ Panel 2+ support DSC Power G sensors, so you would be covered either way and shouldn’t need to replace any sensors in general.
The cost of the TL8055LT module looks to be about half of the cost of a new IQ Panel 2+ with DSC legacy radio. So if you are looking for an upgrade and need a new module anyway, the Qolsys panel is a good option.
Now if you can reuse the existing module that would be the most cost effective option, of course. If you are having trouble viewing from the keypad, you can try checking on the module sticker inside the panel. See below for an example of what it will look like:
Alright, if you are just planning on replacing sensors we have recently reduced pricing on our IQ Panel 2+ bundles here. These would have GE319.5 mhz and Power G sensor radios.