what else do they have to offer over TT Business Fibre.
I am also looking at migrating from the hell that is PN and im looking for a good stable provider.

Anybody can correct me if I'm wrong but currently I believe Pulse8's service is just TalkTalks Business service resold... the only benefit I can see is what you have already highlighted and that is the rolling contract.
I too am one of the Plusnet DROPee's, I'm currently awaiting migration to Zen's service in the next week or so, I chose Zen over Pulse8 based on Pulse8 being very unsure about whether they could do the migration or not, they also didn't respond to 3/4 emails over a 2 month period and when they finally did (after a Twitter bashing) they didn't answer most the questions,
So I ended up calling the very helpful and friendly Adam Fullalove and we had a chat about the issues with migrations and various costs for activation, services and also line moves and other future plans "of mine", so no complaints there at least
Zen won my choice based on them having there own network equipment in my area (LLU) which I preferred over BT Wholesale's links, though with Pulse8 using TalkTalks LLU that was just as good, but overall Zen offers a block of IP addresses free of charge and they are currently trialling IPv6 on their service too,
and overall my most important reason was the prompt and quality electronic communications between myself and Zen's Sales and Technical departments, and even the Business Movers Team was very helpful providing a list of prices based on several future scenarios.
One of my warnings about Pulse8 would be that as there is no contracts, Pulse8 will be sure to pass any charges for activation, new lines, new xDSL service activations ect. on to the customer, this don't sound to bad and is a reasonable request from them but as I found is quiet a cost,
Example. Moving line to new premises without line will incur, £90 = New Line £50 xDSL 1st Activation £30 Fibre Upgrade/Activation (Total = £170) Not sure if these prices are with or without VAT... I presume with!
So if you looking for a flexible service (no contracts) I would recommend Pulse8 based on the feedback on here, if you are however looking for a provider that will absorb some of the costs listed above low and you don't mind being in a contract then I would look elsewhere.
I hope this information see's you right