A nice compilation of levels based on 1 room per official hold. I'll just give a quick comment on each of the entries:
Sixth Level: One of the hardest entries in the hold, a nice symmetry across the rooms although the look doesn't really change throughout.
Museum Of Modern Architecture: Looks good, could imagine rooms being part of the official holds. I thought the TCB room was excellent.
The Time Capsule: Another difficult hold especially the TCB room, aesthetics were good for each room.
familiar places: Doesn't really follow the rules, the TCB room has unexplained scripting and the GatEB is pretty hard
What Could have Been: This was okay, didn't really like the JtRH room as it seemed a bit trial-and-error, the TCB room was horrible, possibly the worst in the hold...
The Four Ages of Budkin: I really liked this entry, each room represented the associated hold well and the puzzles weren't too tricky.
Memories...: This was okay, can't really think of much more to say about it (it was about 8-9 months ago since I played this hold...)
Tribute to major release: Decent puzzles, didn't really feel they represented the official holds though.
!praW emiT: This was possibly a tongue-in-cheek entry and I appreciated the GatEB room but the AE and TCB rooms just took too much time.
Christmas Carol (not sure what the entry is called officially): This looked good but some of the puzzles were pretty brutal.
Through The History: Felt the puzzles were too difficult to accurately represent the official holds.
DHM (lots of random characters...): Nice small rooms, not a bad entry.
The Living Tar: I enjoyed the GatEB room, the first two were a bit of a slog though.
The History of DROD: I loved this entry, constantly entertaining, self-deprecating humour but not in a negative way. Scripting for this must have taken a lot of time. I would recommend this as a minimum for someone playing this hold.
Back in Time: Nice puzzles, uses the same style for all rooms though.
4 Rooms: First and last rooms are pretty hard although not overly frustating, a good entry overall.
Forgetfullness: Rooms all seemed similar, scripting at the end of the JtRH room is not appreciated.
Overall some good entries, some okay entries. None of them would say were particularly bad.
Difficulty: 7.5
Fun: 7
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Without struggle, there is no progress, so get up, get out, and go make the rest of your life the best of your life; you deserve to live the life that YOU want to live...
Progress - Gavin G