Resurrecting this thread since the the context of the previous replies applies: I'm at the point where I've replaced half of the RX groupset with the 105 equivalent. The rear derailleur was practically unusable (b-screw tension non-existent), the front derailleur fiddly as all get out, and now the front derailleur brifter's catch pawl is failing to hold the shift (you get the clicks and it moves the derailleur, but it won't hold). I've done all the usual flushing and fiddling, and I'm on the verge of just buying a used pair of 105 7100 brifters. I've got 2500 miles on this groupset.
Worth noting: Ltwoo's customer service via their AliExpress store was completely unhelpful, and basically expected me to prove someone told me the groupset had the 2-year warranty. Helpfully, AliExpress doesn't retain old chats, so I had no way to pull up the old conversation where I confirmed this was the case before purchasing. They were all "We're sure we can help solve your problem today! 😀😀😀" and quickly flipped to "we're sorry but unless you can provide proof you have a warranty despite us seeing you bought this less than two years ago we can't help you 🥺👉🏽👈🏽". Oh, and the brakes have always been finicky/prone to sticking pistons. 5 stars! 😛
On the bright side, dealing with such finicky equipment has taught me a ton about bicycle maintenance/tuning, though I'd have much preferred to have just been out riding than at home with my bike on the stand. If I was to do it again, I'd probably just buy a used 105 groupset- it would've been cheaper than buying everything one at a time like I've ended up doing here.
Worth noting: Ltwoo's customer service via their AliExpress store was completely unhelpful, and basically expected me to prove someone told me the groupset had the 2-year warranty. Helpfully, AliExpress doesn't retain old chats, so I had no way to pull up the old conversation where I confirmed this was the case before purchasing. They were all "We're sure we can help solve your problem today! 😀😀😀" and quickly flipped to "we're sorry but unless you can provide proof you have a warranty despite us seeing you bought this less than two years ago we can't help you 🥺👉🏽👈🏽". Oh, and the brakes have always been finicky/prone to sticking pistons. 5 stars! 😛
On the bright side, dealing with such finicky equipment has taught me a ton about bicycle maintenance/tuning, though I'd have much preferred to have just been out riding than at home with my bike on the stand. If I was to do it again, I'd probably just buy a used 105 groupset- it would've been cheaper than buying everything one at a time like I've ended up doing here.