Did 170 miles on the varadero this weekend, 50ish on Saturday and 120 today. After 2 weeks and nearly 600 miles on a 125, I can already feel myself wanting a bigger bike...
Commuting to work and back, it's perfect - does 70mph on the short dual carriageway section, and if the car drivers are nice, will get past the traffic doing 50mph on the NSL single carriageway parts. And costs less than £14 for 200 miles worth of petrol.
If I only ever wanted it for the commute, it's all I need. However, doing 120 miles on a ride out today to Margate via Canterbury, then back via Sandwich and Canterbury, getting stuck behind bank holiday drivers doing 40-50 in NSL zones, and having to reeeeeeally plan any overtakes (did manage a couple, even some 2/3 car overtakes past the really slow ones!), the limits of a 125 are becoming more apparent.
Noticed this especially when a group of guys on sports bikes (think there was a GSXR, R1, and about 5 other bikes) came past on the A20, I'd been behind this bunch of about 5 cars all doing 45-50 in a nice sweeping bendy 60 zone
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and before I knew it they were past all the cars in front leaving me in their dust (literally!) thinking "You Barstewards. Now hurry the
**** up cars! Oh wait there's a gap.... nope, it's less than half a mile and I need 10 seconds run up first... *sigh*"
It's fun on a quiet A roads (The A252 is a cracker) with some nice sweeping bends though, I'm never doing more than 65 (indicated) on these roads (70+ needs a decent run up) so it's good clean legal fun. Could just do with a bit more top end at times. the acceleration between 40-60 is, erm, lacking somewhat.
DAS (or a few weekend lessons) in a few months time I reckon.

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5 months and 4500-5000 miles on a big 150kg 125cc should be enough experience to only need a couple of lessons on a "big" bike I reckon.