The dreaded Samsung corroded and broken spider problem showed up in an 8 year old machine as banging during a cycle (due to basket being off center) and squeaking during rotation (due to basket rubbing front diaphragm). Repair is fundamentally easy, but takes a long time and is a lot of work due to the large amount of disassembly and weight of the component parts. Some tips for people wanting to perform their own repair:
1) It is inevitable that the spider will be grossly corroded and broken, so buy one ahead of time
2) You will NEVER get the old spider bolts out intact due to corrosion (unless it's a near new machine), fortunately the heads break off easily, so buy spider bolts ahead of time.
3) Always replace the main shaft seal, regardless of condition - cheap insurance
4) The condition of the bearings depends on the seal - If it failed and water got in the bearings, they have to be replaced - If the seal didn't fail and the bearings seem good, leave them in place and they will probably last another decade - It's the water that causes failure, not wear
5) You can reuse the tub gasket (between tub front and rear halves) - I replaced mine, but regret it because the new ones does not fit as well as the original one and causes housing distortion when reassembled, A little silicon seal will help seal the old one (assuming it has not deteriorated)
6) The tub assembly is HEAVY, so remove the front cross brace and get 2 people to help - Alternatively use an overhead lift of some kind since there is a handy lifting eye on the tub used in original manufacture
7) The stainless steel basket will be heavily corroded by the disintegrating spider, so it has to be cleaned by dipping in CLR or equivalent - it will dissolve all the corrosion leaving it spotless
8) Consider coating the new spider to extend life - I used a marine zinc phosphate primer suitable for in-water use, which should reduce corrosion formation for a few more years
All in all, a successful repair for about $120 (spider, bolts, shaft seal) and a full day's work, although adding bearings would cost another $50 (Bearings are Nachi 6305ZEE and 6306ZZE, available from others since Appliance Pro doesn't carry them). It's worth doing if your machine is in good shape otherwise, since a new one costs $600-$900 and this is really the only major design flaw for this machine.
If you have a Samsung front load washer, you WILL eventually have this problem because the spider is unprotected cast aluminum and sits in a hostile environment. One hint about when the failure is occurring is the discovery of black bits of corroded aluminum in the pump filter. If you see that combined with banging, squeaking or grinding/marbles sound when turning the basket you know the time has come!