I also have the upgrade version on order so I just picked up this GG without the glider to replace my Toys Era Fiend on the TE glider. The pegs on the TE stirrups are further forward than those on the HT glider but it's easy enough to drill extra holes on the bottom of the HT GG's feet to provide the necessary clearance. The HT feet are wider than the TE feet so the heels don't quite go all the way down into the stirrups but the fronts fit securely under the toe guards. Between that and the figure clamp on the TE stand he stays on the glider just fine. It definitely can't match the TE Fiend for flexibility (it has zero ab crunch and barely any bend at the waist due to the restrictiveness of the suit), but between the knee articulation and the ever so slight waist bend he looks pretty good. I'll be keeping the TE Fiend for when I want to do extreme poses but for now this HT Goblin+TE Glider combo will represent the 2002 OG Goblin in my collection. Full disclosure: While I prefer the HT's paint applications, mask shape, suit design details & pumpkin bombs over those of the TE Fiend, the limited articulation pretty much negates what are marginal improvements in all those aspects. If I knew then what I know now I probably wouldn't have bothered ordering this one.
Hopefully HT has designed the Upgraded figure's suit such that its articulation isn't quite so limited. I'm not overly optimistic but only time will tell...