(Sorry for a little Turkish intermission) Hocam kısa bir tanıtsaydınız kendinizi forumun tanışma kısmında fena olmazdı demek ihtiyacı hissettim, yanlış anlamazsınız umarım. Direk üye olup ilk mesajı genel bir soru olunca çok dikkate almayabiliyor forum ahalisi. Ben kendimce cevaplamaya çalışayım.
In the forum, there are numerous topics that deal with the Givi cases in detail, and some about H&B as well. As for the originals, I haven't seen any complaints about the panniers, but there is the water leakage problem with the topcase. If you ask me, and some others probably will agree, the only problem with the original panniers is the ridiculous price Honda is asking. Other than that, I think they are quite good. I would get them if they were somewhat cheaper.
In the Givi products range, the two most commonly used sidecases for CT are Trekkers and V35. Both have about the same width when applied, and neither of them looks bad. If you ask for a recommendation, I myself have chosen Trekkers, but I could have just as easily picked the V35s. There is also the new Givi Trekker Outback coming out this summer, but being made of aluminium, expect to pay a premium price for it. I don't cross deserts on CT, I dont think I will need that much extra ruggedness. Each to his own though, I'm just saying.
Trekkers come in 2 sizes, and I think they look good on CT with 46L top and 33L panniers as a set.
As for H&B, I have used Gobi a few years ago as my topcase, it was a solid topcase. I considered getting the H&B Alu Exclusive for my CT, but the 45L version looked too big for my liking. Its the same size as Trekker 46L, but somehow it looked bigger on my bike despite the equality in size on paper. And thats not what I personally prefer. I want to keep the bike neat and narrow.
This more or less sums up what I have to say about it. I strongly suggest checking the Accessories section of the forum, there are numerous threads in there already.