Here using two OmniPro 2 panels > 10 years. One of them is in a compact format in a closet in the middle of the home.
I am not a professional installer of this stuff. In one home security wiring was completed by GC (general contractor) and I terminated each side a bit at a time.
I have installed EOL resistors on all of the zones (main and attached). I was doing this though with earlier non Leviton panels many years ago.
I like the compactness of the OmniPro 2 panel. Using UPB as main light switch transport plus X10 (on steroids), Zigbee and Z-Wave. Compactness is one closet (9 foot ceiling) with Omnipro panel on top and Leviton media can below. It has worked relating to the WAF (wife acceptance factor tidy and neat) as I did invade the laundry room and build a custom closet for the stuff. It is behind two doors and not really noticed; but difficult sort of if you need to do something with it. I really have only opened it up twice since after installation in the last 5-6 years. Due to WAF also have removed the follow me lighting stuff using the panel's sensors in the home.
Recently replicated Z-Wave network running on Homeseer to the Leviton VRCOP. It is a secondary to a Z-Wave Plus GPIO card.
I also am using a Russound zoned audio system and OmniStat with the OmniPro 2. Legacy Omnitouch screens and IP Omnitouch screens. Both do CCTV fine for me. (very low resolution on the serially connected Omnitouch screens - simple big buttons nothing really fancy here).
Both the Leviton HAI Omni and Elk M1 series of panels were the first to combine security and automation in one panel starting in the 1990's. With the adds of software you can remote control and utilize functions via the software GUI or software touchscreen. (Here do both). You can purchase a touch screen designer software for the OmniTouch screens.
I mention first commonly used combo panels as I had a primitive (to today standards) combination security / X10 with TTS panel in the 1980's. Access / programming was buttons on the panel or keypad (no touch), 48 zones on the panel and TTS had to be put together by pieces of or entire words. Children gave the house a name back then.
The OmniPro panel uses a serial bus (old and slow - always works though) for communications and optionally the network bus for communications to the panel. This is a bit similiar to a typical automobile / aeroplane that utilzes a wired serial bus to the hardware. (flaps and engine on a plane and engine stuff on an automobile). IE: my automobile today with a mini PC connection can do everything but drive it remotely - IE: start, windows, lighting, hvac, engine diagnostics, et al.
Tinkering with automobiles when they were new (very low on the WAF to take apart the automobiles).
Curious if you are outside or inside of the US. While both panels can be made to be utilized with non US voltages I have seen other choices of combo security panels in the EU, UK, Middle East, South Africa, South America, Central America, Pacific Rim and New Zealand and Australia. Not sure of the interplay though with 3rd party software stuff.