Warpstone Flux Rating: ⭐️⭐️⭐️⭐️
4/5 stars. The rules are notably good, but the Land Speeder won't suit all armies.
A more heavy weapon orientated grav craft than the jetbike and similarly able to have good speed and maneuverability. These are comparatively rare constructs and valued by many legions.
Good movement rates, T=6 and W=4 make for a much more solid version of the jetbike.
These multi-marine Land speeders have nice rules like deep strike, firing protocols, and hit and run, as well as Harbingers of the Legion (can't join other units, but you get re-rolls of shrouded for completeness).
The ability to take those lascannons and multi-meltas is excellent.
Ld=8 is problematic.
Javelin Land Speeder (90 points).
Take several of these for sheer firepower. The heavy bolter and missile launcher is surprisingly effective in large quantities.
Javelin Land Speeder with Two Lascannons (95 points).
A long range option for taking down heavy targets or monsters (or even buildings).
Javelin Land Speeder with Multi-Melta and 2 Hunter-Killer Missiles (110 points).
Tank hunting. Take more than one to make sure.