Bodfather... reforgeing just came out with pub 75, maybe 2 months ago. Basiclly reforging is a bonus for crafters who also have imbuing skill, allowing some really nice mods. If you are familiar with shame loot, now those new mods are craftable by reforgeing.
The damage eater, and damage type eater mods are not a bad lil bonus mod, in theory...but they only return a tiny bit of health, and only after you stop getting hit for a few secs...so not of much value imo.
As far as reforge for Sampires, id suggest aiming for HCI on plain wood woodland pcs, then enhance with heartwood to double the HCI if your lucky to 10%...it seems imo to be the best reforge option avail to sampires. Personally, id use oak runic saws and plan to imbue, but useing yew or heartwood saws can make some godly pieces.
If you already have a good older samp suit i really wouldnt rush to replace it.