I've come a little late to the party. If anyone knows me from the TFC suggestion forums, I get very, very, hyper-active on the forums for a few weeks, then stop and never come back. So if I stop forever, try spamming me. That usually works.
But anyway, back to my actual point about 1.5.
I rate content into three tiers: tier 1, tier 2, and tier 3. I have used these to make my redpower vs. buildcraft argument and I will use them here. A higher tier is NOT necessarily better.
Tier one are things perform a relatively simple function, and do it well. Buildcraft mining wells (direwolf20 spamming aside) are a good example; they have one use and are used for that.
Tier three are things that are not as good at simple things (tier one is better) but can be assembled into massive, complicated things that can do things that tier one objects can only dream of. Redpower frames are a good example. Using frames to transport items is stupid, but they can assemble amazing things.
Tier two is kind of caught in the middle. Basically, they still do one job, but it's a more complicated job. Also, they can't usually be assembled into anything grander. Buildcraft quarries are kind of an example: what they do is great, but that's about all they can do.
Tier three is amazing. Period. However, it is often overkill, laggy, and inefficient for just picking the drops from my mob spawner etc.
Tier one is good to have around just to the small things.
Tier two is the middle child of the family. They're not amazing enough to stand alone by themselves, and they can't be used to build greater things.
Point is, tier two sucks.
Redpower has almost all of the tier three objects in feed the beast. However, there isn't very much tier one stuff. Using filters and pneumatic tubes is overkill when diamond pipes are must simpler(although more expensive). Redpower can and will always be capable of doing things buildcraft can only dream of. But, many new players prefer buildcraft since its tier one is better. But I digress.
My point is that 1.5 has added a huge list of tier two things. Redstone signal strength for example, and block hoppers.
If I could remove this update, I would.