The LSI 9201-16i did work quite fine for me until I did upgrade the Bios to solve a warning issue...
It does not offer RAID support, but I did install FlexRaid to manage that. Using Snaphot Raid, I really have good read/write performances (the mean throughput through my Gigabit network is above 100MB/s - while the theoretical max for such network is 125MB/s)
Really easy to use to build a NAS, the only detail I noticed is that the passive cooler becomes quickly very hot (even if there are no disk controlled yet and therefore not a lot of activity).
The biggest issue I experienced was with my Asus Striker II Formula (a MB not using UEFI) with onboard Raid Controllers and a Promise FastTrak SAS controller. Out of the box (with a Firmware 15.0.0.0 and a Bios 7.5.0.0), the LSI card was preventing the FastTrak to execute its boot sequence. I was only able to configure the FastTrak at boot time by unplugging the LSI. With that Bios, the MB was initializing its own onboard RAID controller before executing the rom of the LSI.
To solve this minor issue, I did update the Bios of the LSI to the latest version (7.29.0.0) and since... I have a biiiig issue: the motherboard does not complete the boot sequence anymore. It stops after the LSI initialization, EVEN if I unplug the FastTrak !!! The LSI boot sequence is executed before anything else, including the initialization of the MB onboard RAID controller....
The LCD Poster of my MB mentions that it's stuck on the "Load Menu" (or on "Entering Setup" if I did press DEL). And I can therefore even not boot on a USB key if the LSI is plugged
If I use this LSI on my ASUS P9X79Pro (with EUFI support), the PC boots fine ! (I would like to downgrade now the bios of the LSI back to 7.5.0.0 but I don't find this version anymore....)
Conclusion: check twice the list of compatible SAS controllers on LSI website and preferably use this card with its latest bios on a recent Motherboard