Thanks everyone. A few differeing views.
At least no-one has any real disaster stories about getting 30 or 40 hours into the training and then realising they'd made a huge mistake. As I said, I'm happy at the moment so will carry on jumping between instructors for the time being. Otherwise, I'll need to get a 'real' 9-5 job so I can fly the same days each week.
WWW, I realise it's 'cause for some concern' - I suppose that's why I asked the question, but since I don't appear to be having any real problems as of yet, it'd be useful if you could go into more depth. At what point am I likely to start having problems? Is there a huge pitfall waiting for me which I haven't thought about?

Thanks.
There seem to be others in the same boat (Dkosky, at least - must be more) - am I the only one worried about this? Should I just get on with it? If the weather wasn't so crap I'd have less time to sit around worrying