There are many businesses that have been completed ****ed up by Paypal, so proceed with caution.
They are known to freeze your account without warning instantly, and fail to respond for days or several weeks sometimes while they do so. It only takes one customer with a small complaint or some other computer-generated trigger, or someone 3 transactions down the chain using a dodgy credit card, and Paypal will suspend your account even if you have done nothing wrong.
A fraudulent customer can false claim they didnt get delivery, and even if you provide all the proofs of despatch, signed delivery etc they will decide in the buyers favour.
You can email them, call them all day long for weeks, it wont make any difference. Paypal conveniently register themselves outside the UK, at a PO box number in Ireland and an address in Luxembourg, so its not easy to sue them.
I have heard first hand of dozens of horror stories of small businesses going bust because of Paypal's antics. They block your account then ask for all sorts of documents - your supplier invoices, your passport, names/addressses of all your suppliers, your audited accounts, they do a credit check on you and your company, your bank statements and then when you provide them, they dont respond for weeks, and then ask for more irrelevant documents while they keep your account on block.
I would always advise a proper merchant account rather than Paypal. At least a proper UK bank will write to you and give you 14/28 days to reply or resolve any issue, rather than just suddenly freezing your account and funds!
The whole Paypal/Ebay (owned by same people) monopoly is disgraceful, how they force you to use Paypal on ebay many times, how they take percentage commission at both ends, how they charge commission even when the funds are already in the Paypal system. I can see Paypal come crashing down sooner or later as the rate of dissatisfaction grows and the number of anti-paypal sites increases.