Pensions I don't know. If you can convert your retirement account to an IRA then you can create a self directed IRA and your flexibility is pretty good. I did this in 2010 and have no regrets and 84 acres of row crop in my IRA that is leased out tax free.
Pensions; you usually have to wait to retire or quit the company. 401k's you can move the money to an IRA at 59 1/2 years without taxes actually in 401k's you can take money out at $10,000 increments or make arrangements for other types of distributions at 59 1/2 without the 10% penalty . Only when you start pulling money out you are taxed.
Unlock Pension Cash sounds like they are making you a loan against your pension, I bet at high interest rates.
Typically those companies that pay cash for annuities make a profit from the annuity and pay you a cash settlement that is 20 to 50% less than the mature amount. the Mega-Millions and Power Ball lotteries do that if you take the lump sum cash payment instead of the annuity annual payouts.