Recommendation for Jig Saw

[Burst Boiler]

I suggest a two piece one.

Apologies, I have been drinking post-Calcutta Cup.

[Gardenshed]

jig saw & straight line? are you kidding?
you only get that by clamping a straight edge to the job and using that as the guide
not much in it between the usual DeWalt, Bosch, Makita etc. more critical is the operator
my old black and decker works fine just now, but if/when it fails, I'll go with Bosch re-chargeable as the batteries are interchangeable between

[wully]

I’ve got Erbuer drills and plunge saw. Decent home quality for sensible money and if buying any more power tools I’ll stick with them for the battery interchangeability.

[Gardenshed]

I was pleasantly surprised that when I bought a circular saw last year, the new battery fitted my 6yo Bosch drill. As they are all Li, they keep their charge so whenever you pick it up, it works. As tools die I'll go cordless as there are very few times when I run them continuously and run out of charge. With interchangeable batteries, you can just swap them and continue. Its also much less hassle when you want to do a job, no messing around with cables and plugs.
As for straight lines.....

[wully]

I cannot cut anything resembling a straight line with any jig saw I’ve ever used. It’s a ‘bit’ easier with the Plunge (circular) saw.

It’s easier and cheaper if I get someone else do make the cuts though

[Gardenshed]

I bought replacement bits from Power Tool Spares https://www.powertoolspares.com. The shoe plate is upgraded from pressed steel to a thicker and I assume more rigid die cast plate. New blade clamp and shoe plate, £7.40. Cheap as chips!