For the moment, just make sure you leave a slice of the SSD unused. You could also on occasion backup the OpenBSD install, replace it with an empty ext4fs and fstrim it via a livecd, then restore the OpenBSD install.
It works like a charm on any intel i-series CPU with integrated intel HD graphics and most intel wireless chipsets (excluding the newer AC* versions).
I use it exclusively on servers, and on all laptops/desktops I use for real work. Its a breath of fresh air! No bloat, no evil, gets the job done - Not to mention some lovely features such as Full (no unencrypted boot slice) disk encryption via softraid, a completely unprivileged X server (with KMS supported GPUs), and a brilliant set of simple and solid daemons included in the base system.
The only time I'll switch away is to use linux - The two reasons there being 1) High-end Gaming, 2) Virtualization.
Not to mention another verifiable source for the signify keys.