I've used The Online Trader for many years now - I think around five years or so. I think it's pretty good, and they'll give you a free trial. If you plan on trading Nordic stocks I would choose this over any other platform, but not for futures or forex.
Also, be aware that at times they have problems with quote dissemination from the stock exchanges - sometimes it's the exchanges (most frequently) and sometimes it's them. Can't believe this is 2006 and quotes go down.
Pretty solid charting I'd say. Their trade reporting is about 0.3-0.5 seconds after the exchanges (I trade Oslo Stock Exchange and reside in Oslo, and I have a java broker feed which beats TOT on this) but order book updates are on time. This is way better than eSignal which are even slower.
They offer the Norwegian chat channel which is helpful if you trade Norwegian stocks and is a mid-size trader (however you define that).
They have integrated order handling with a few brokers, I haven't used this feature and handle my orders separately for now. I am currently negotiating with one of the brokers to switch part of my account and get them to pay for TOT in the process.
You're mentioning price. Well, they're not cheap, but I think considering what they're offering they're not too pricey either. Some of their exchange fees has been bloated, I don't know why. I don't think that's a positive, it kind of gives me that eSignal "we'll suck you dry"-feeling. When exchange-fees are so low in the US (for level 1) they should not have to price it up.
Their option analytics is nice for someone not going too deep into it - you get the greeks, but no visuals of vol-smile and so on.
All in all it's a very solid platform. I don't think I've had a crash the last 3-4 years for sure, so it's definitely stable and far into the development process. They provide updates from time to time, and add new features on request (I've been in their beta program for some time, and they listen to feedback).
Hope this is helpful - if you have any more questions I'll try to answer them here.