This is the first tracker I have used and I bought Renoise after playing with the demo on Linux. My background is in using traditional sequencers. Ive been learning and playing with Renoise for about a month.
What you love…
Linux Port: Ive been using Linux for about 2 years and this is by far the best port. Thank you again for bringing this to Linux.
The speed: The fact I that I hardly have to touch my mouse (even though it makes the learning curve greater) is a big plus.
Single Interface: No windows to open, rearrange, minimize. Using the F Keys to move around is very cool.
Always Zoomed In: I like that Im always dealing with maximum resolution instead of zooming in, editing and zooming out.
Sampler: Definitely like how a sampler is built into Renoise.
What you hate…
I dont hate anything about Renoise.
What took a long time to understand…
The whole tracker concept. This is the first tracker Ive bought and used. There was a really long thread at KVR about Renoise and trackers. When I realized trackers work from the bottom up; the other way around to sequencers it made sense to learn it.
What not…
Using keys instead of a mouse to navigate around is cool 
Whats still a misery for you…
Playing long samples when starting in the middle of a pattern. When JACK sync is implemented it will be a non issue because I could sync Renoise with Ardour or QTractor.
What should be changed to make existing features more prominent and easier….
I don’t know enough about Renoise to suggest anything. Every time, so far, Ive thought of a problem reading up, asking in IRC and experimenting has solved it.
Which tools in Renoise seem totally useless to you (just bloat the interface)…
Again nothing. It all seems to be very well thought out.
Which tools do you miss…
Being able to jam with patterns in real time (EnergyXT, Live)
The ability to make my own macro’s of functions (Reaper)
Docking VST’s (EnergyXT)
Feature requests…
Besier curved sampler envelopes.
“Timestretch” and “Tape” play options in the sampler.
Pattern Arranger.
Keep up the good work 