In my experience, if you have to ask then you've already made the decision. Think about this: the first 3 things that you like about the bike are cosmetic. The first thing you don't like about the bike has to do with the design of the bike. My recommendation? Get another titanium bike, but in custom to fix all the things that you don't like about this one and enhance the things that you do. It won't be cheap, but it will be worth it. My preference, personally, is for a Moots RLS. It should weigh in around 1200g for a ~56cm, which isn't earth shattering, but certainly light enough to build into a sub-15 pound machine.
I'm trying to decide if it's time for a new bike. So, forewarning, this might be a long post.
What I'm Riding:
As some of you have seen, I have a 2007 Litespeed Siena (Ti bike) which is supposed to be a relatively stiff frame for Ti. My experience with other bikes is limited. I had a carbon Merckx when I first started but was inexperienced at the time.
My Riding Profile:
I weight about 68kg and would consider myself an all around rider. I can keep up on climbs under 20 minutes in road races and can hold my own in crit sprints. I probably do about 20 races a year, a mix of crits and road races. I've been competitive lately, getting top 10s, and should be upgrading to Cat 3 soon. With that being said, I'm not super serious about racing. I enjoy the competitive aspect of it, but if I was truly serious, I'd be training a lot more than my 3-4 days a week.
I do competitive group rides on the weekend for training as well as some weekday training rides. I've been doing fewer and fewer long rides. Usually my Sunday ride is my longest at 75mi.
I'm generally a timid descender unless I know the road well. In races, I can usually out-descend most if it's technical and I know the road. On a local popular climb that I know well, I'm near the top 10 for the descent segment.
Why am I considering a new bike?
I love my bike, and for the most part have not felt it has held me back. However, between friends telling me that I need a carbon bike and that getting into my head, I've begun wondering if I'm missing out on something.
What do I like about my bike?
1. It's extremely unique and I love how it looks.
2. I have a tendency to scratch clear coats, but can't with this bike. Scratches and chips bother me.
3. With everything else, I have to have the newest and best. If I get a carbon wonder bike, I will want to replace it with newer models.
4. The bike has sharp, responsive handling, so it navigates well it crits and races.
5. The rumble of chipseal is non-existent to me. With a pair of shallow rims, it's no different than riding on smooth tarmac with this bike.
If I had to point out a few niggles with my bike, they would be:
1. High speed descents require my attention. Probably due to the short wheel base, but I'll never be one of those people that are riding no hands down the mountain. Further, I'm not fully comfortable descending on the hoods at high speed, but that's partly because I feel like I have less control, not so much because they bike is doing something I can't control.
2. I've noticed flex in two situations: during 600w uphill intervals and flat sprints if my form isn't great. Does this negatively affect me? No idea.
3. My frame is heavy. (This is WW afterall)
So, any words of wisdom? I'm going to the Specialized Demo day this week to test the Tarmac SL4 (probably try the disc model). I don't really want a new bike unless it's going to improve some aspect of my riding. I'm expecting the SL4 to feel stiffer, but I'm not sure that stiffer equates to faster. Also, if I did get a new bike, I'd have to get rid of the Siena due to space constraints.