The T1 has a single outlet, while the T8 has eight. See how that works? Both include high-current surge protection features. The T8 adds in RFI AC line filtering, which means there’s less of a chance that RF noise will bother the AC supplies of your connected A/V equipment.
Both also have swiveling plugs, which makes it easy to squeeze another power supply into tight spaces or at awkward angles. The T1 turns a full 360 degrees. The T8 has six outlets that turn 180 degrees, with two other fixed jacks. That makes for a nice mixture of cords, twisting in various directions.
The 1,875-watt T8 rates with 2,160 joules, while the 1,500-watt T1 has 202. Both units are available now, with the T1 costing a mere $20 and the T8 priced at $50.